Studies of the Amount of Cratering at Different Locations on the Moon

Studies of the amount of cratering at different locations on the Moon indicate that

A) the rate of cratering in the Solar System has changed dramatically over time.
B) the younger lunar surfaces are hundreds of billions of years younger than the oldest surfaces.
C) the Moon has never been geologically active at any point in its history.
D) most of the heavy cratering in the Solar System occurred before Earth formed.