Mars,Venus,and Earth Are Much Less Heavily Cratered Than Mercury and the Moon.This

Multiple Choice

Mars,Venus,and Earth are much less heavily cratered than Mercury and the Moon.This is explained by the fact that

A) the rate of cratering in the early Solar System was strongly dependent on location.
B) all three have thick,protective atmospheres.
C) Earth and Venus were shielded from impacts by the Moon,and Mars was protected by the asteroid belt.
D) Mars,Venus,and Earth were geologically active longer than Mercury and the Moon.