Which statement about the focus of an earthquake is true?

a) an earthquake's focus is beneath the earthquake's epicenter
b) along a divergent boundary, an earthquake's focus can be as much as 5000 kilometers beneath
earth's surface.
c) energy only travels upward from an earthquake's focus.
d) the focus is the point above the epicenter.

a) An earthquake's focus is beneath the earthquake's epicenter

Explanation:

The earthquakes occur as a result of the adjustments that happen deep below the surface, where the crust cracks under the enormous pressure, and the gaps opened up from it are filled with other rocks. When that happens, the amount of energy that is released is enormous, casing strong vibrations that manage to reach the surface as well as cause a lot of damage. The place where the earthquake appears is called focus of the earthquake, and it is located deep below the surface. The place above it in a vertical straight line on the surface is called the epicenter. The vibrations spread around in concentric circles, being most intense near the place of origin, and weakening as they move further.