The force that drives earthquake activity is

The force is plate tectonics.

The lithosphere, which is the inflexible peripheral shell of a planet, is broken into structural plates. The Earth's lithosphere is made out of seven or eight significant plates (contingent upon how they are characterized) and numerous minor plates. Where the plates meet, their relative movement decides the sort of limit: focalized, unique, or change.

Seismic tremors, volcanic action, mountain-building, and maritime channel development happen along these plate limits. The general development of the plates normally runs from zero to 100 mm yearly.

i'd say that the moon rock is about 2.2 billion years old.

a and c are the answeres