What do we conclude if a planet has few impact craters of any size?

a. the planet was never bombarded by asteroids or comets.
b. its atmosphere stopped impactors of all sizes.
c. other geological processes have wiped out craters.

The correct answer is B.

Explanation: If the planet has few, that does not mean there is 0, there could be some, we do not know. So A would not be correct. What things could get rid of craters? As far as i'm aware, there is no such thing that can remove, or fill in craters that is a geological process. Anything I can think of would be done by humans.

C. naturally in the environment

Answermost of the time it would be ground into fine sediment,and sometimes they are carried away from the original location;