To answer the question, we are looking for the subject or subjects of the sentence.

"We went to the store today. "

"We" is the subject, and we means more than one person. The sentence is about more than one person.

To answer the question, we are looking for the subject or subjects of the sentence.

The subject is who or what a sentence is about.

"I swam in the pool yesterday."

"I" is the subject, and I means me, which is just one person. The sentence is about one person.

A noun is a person, place, or thing.

"Dog" is the correct answer because it is a thing.