Suppose That Two Regions on the Moon Have Ages, Respectively

Suppose that two regions on the Moon have ages, respectively, of 3.7 and 4.3 billion years. Based on these ages, we expect to find that:

A) the older region has fewer craters than the younger region because the cratering rate was lower at earlier times.
B) both regions have roughly the same amount of cratering because they have approximately the same age.
C) the older region has 16% more craters than the younger region because its age is 16% greater than that of the younger region.
D) the older region has far more craters than the younger region because of changes in the cratering rate over that time.