The dominant geologic process in our solar system is:

A) impact cratering
B) space weathering
C) plate tectonics
D) volcanism

Impact cratering is the dominant geologic process in our solar system, as evidenced by the surfaces of planets, moons, and other bodies being heavily marked by craters from impacts over billions of years. Plate tectonics is largely unique to Earth, and while volcanism and space weathering are significant, they do not have as widespread an impact across the solar system as cratering does.