MOST of the Craters on the Moon Are Thought to Have

MOST of the craters on the Moon are thought to have been caused by:

A) the collapse of volcanic domes, leaving central peaks in the craters.
B) volcanic activity, leaving behind volcano craters similar to those on Earth.
C) continuous bombardment throughout the Moon's life, including the present and recent past, by large and small asteroids.
D) intense bombardment by large and small bodies over some specific early period in the Moon's history.