Craters on Mercury Appear to Have Been Produced by

Multiple Choice

Craters on Mercury appear to have been produced by

A) impacts by objects from space continuously throughout the planet's history,including very recently in geological time.
B) volcanic eruptions early in the planet's history.
C) successive expansion and contraction of the planet's surface,caused by intense heating by the Sun and severe cooling during rotation,because the craters appear to be in irregular lines across the surface.
D) impacts from objects early in the planet's history.