Question

The point beneath Earth’s surface where rock breaks under stress and triggers an earthquake is called the

a.
syncline.
b.
footwall.
c.
epicenter.
d.
focus.

Answer 1

either epicentre or focus ; I believe it may be focus.

Answer 2

The correct answer is D. Focus

That's the place where the rocks break. The place where the earthquake starts is just above the focus and that is the epicenter.