Object permanence is the understanding that even though an object has disappeared from view, that disappearance is probably temporary: the object has not disappeared totally from existence. Infants do not achieve this understanding until around eight months of age. Because of this, the baby girl likely believes her father no longer exists when he disappears from view, which is upsetting.

Kohlberg's three levels of moral thinking include preconventional, conventional, and postconventional.

From birth to about nine years of age, a child is believed to experience what Kohlberg called the preconventional phase. At this time the focus is self-interest; the child will follow rules just to avoid punishment and achieve a concrete reward.

The other two options, “preoperational” and “concrete operational” are incorrect because they are stages from Piaget's theory of cognitive development.

Kohlberg's three levels of moral thinking include preconventional, conventional, and postconventional.

From birth to about nine years of age, a child is believed to experience what Kohlberg called the preconventional phase. At this time the focus is self-interest; the child will follow rules just to avoid punishment and achieve a concrete reward.

The other two options, “preoperational” and “concrete operational” are incorrect because they are stages from Piaget's theory of cognitive development.

Erik Erikson was a theorist who believed that each stage of life had its own task to overcome. Erickson’s psychosocial stages included the following: infancy, toddlerhood, preschool, elementary school, adolescence, young adulthood, middle adulthood, and late adulthood. He assigned each stage with an approximate age range. In the preschool stage (from about 3 to 6 years of age), Erikson believed people needed to resolve issues associated with initiative versus guilt. He hypothesized that children at this stage will learn to either take the initiative to start and carry out tasks or that they will feel guilty about their attempts to be independent. The other provided options are stages in Erikson's stages of psychosocial development; however, they each have their own tasks (i.e. trust versus mistrust or autonomy versus shame and doubt) and are incorrect.

Object permanence is the understanding that even though an object has disappeared from view, that disappearance is probably temporary: the object has not disappeared totally from existence. Infants do not achieve this understanding until around eight months of age. Because of this, the baby girl likely believes her father no longer exists when he disappears from view, which is upsetting.

Erik Erikson was a theorist who believed that each stage of life had its own task to overcome. Erickson’s psychosocial stages included the following: infancy, toddlerhood, preschool, elementary school, adolescence, young adulthood, middle adulthood, and late adulthood. He assigned each stage with an approximate age range. In the preschool stage (from about 3 to 6 years of age), Erikson believed people needed to resolve issues associated with initiative versus guilt. He hypothesized that children at this stage will learn to either take the initiative to start and carry out tasks or that they will feel guilty about their attempts to be independent. The other provided options are stages in Erikson's stages of psychosocial development; however, they each have their own tasks (i.e. trust versus mistrust or autonomy versus shame and doubt) and are incorrect.

Infants can distinguish speech from other sounds at as early an age as four months old. Shortly after that, they will begin to babble and coo. By ten months old, they become able to distinguish their own native language from others spoken to them. At 12-18 months old, they begin to use words themselves, and they start to understand prosody between 18 and 24 months of age.

Infants can distinguish speech from other sounds at as early an age as four months old. Shortly after that, they will begin to babble and coo. By ten months old, they become able to distinguish their own native language from others spoken to them. At 12-18 months old, they begin to use words themselves, and they start to understand prosody between 18 and 24 months of age.

Kubler-Ross developed an explanation for the series of stages people go through when faced with their own death. According to this model, most people experience the stages in the following order: denial, anger, bargaining, depression, and acceptance. One way to remember this is by the acronym DABDA. Note that shame and anxiety are not stages in this model.

Piaget's stages of cognitive development are as follows: sensorimotor, preoperational, concrete operational and formal operational. Piaget associated an age ranges for each stag that specific developmental phenomena occur at. Preoperational stage occurs at the preschool age. At around 2 to 4 years of age, children Piaget theorized that children experience egocentrism. During this time, children have difficulty perceiving things from another's point of view. For example, a 3-year-old girl may cover her eyes with the intention of making herself invisible from her parents. As a result of her obstructed vision, she incorrectly assumes that her parents cannot see her.