What causes earthquakes?

Question

A.
Blocks of crust slide against one another, often at plate boundaries.

B.
Pressure builds up in the molten rock beneath Earth's crust and causes it to shake.

C.
Tectonic plates break apart into smaller plates, and the crumbling causes shaking.

D.
Sudden motions in Earth's mantle cause the crust to shift.

Answer 1

my answer is b

Answer 2

I would have picked A,
B is more oriented to volcanos.

Answer 3

thx