Answer:
d. The moon condensed into its present form
Explanation:
Late Heavy bombardment of moon occurred about 4 billion years ago. From the Lunar samples brought by Apollo mission astronauts, it was deduced that in a very short span of time, there was a spike in impactors (the comets and asteroids). It is considered by the scientists that many asteroids collided with the inner solar system planets. The present form planets and moon is the result of this period of late Heavy bombardment.
