When we see a region of a planet that is not as heavily cratered as other regions, we conclude that?

Question

the planet is rotating very slowly and only one side was hit by impactors.

the surface in the region is younger than the surface in more heavily cratered regions.

the surface in the region is older than the surface in more heavily cratered regions.

there is little volcanic activity to create craters.

the planet formed after the age of bombardment and missed out on getting hit by leftover planetesimals.

Answer 1

The surface in the region is younger than the surface in more heavily cratered regions.

Smooth, crater-free surfaces on moons and planets indicate geologically young ages, while wrinkles may indicate tectonic activity or volcanism.

Answer 2

All of the answers are possibilities, depending on the history of the planet. The third choice is unlikely.

Answer 3

It may not be right, but I conclude that millions of years ago asteroids would get out of orbit and hit one side of the earth, maybe causing dinosaurs to dissapear. but while only on one side of the earth, probably each year when the earth is facing the asteriod belt, some asteroids will fall down

(sorry if im not correct)