Electric Potential Practice Test

A positive point charge $+Q$ is fixed in air. Point $A$ is at distance $r$ from $+Q$, point $B$ is at distance $2r$, and point $C$ is at distance $3r$. The electric potential is defined to be zero at infinity. Which statement correctly compares the electric potentials at $A$, $B$, and $C$?

A hollow conducting shell is initially uncharged and isolated. A small positive charge $+q$ is placed at the center of the cavity without touching the conductor. Point $P$ is in the cavity (not at the charge), point $Q$ is in the conducting material, and point $R$ is just outside the outer surface. After electrostatic equilibrium is reached, which statement about electric potential is correct?