Answer: b. San Gabriel.
Step-by-step explanation:
An earthquake occurs when contained energy is released in the earth's crust due to the movement of terrestrial tectonic plates. The release of energy causes the earth to move to generate visible fissures on the surface.
The epicenter of the earthquake is considered the place or location where the telluric movement began. In this case, because the earthquake started 5 kilometers below San Gabriel, it can be said that the epicenter of the earthquake is San Gabriel.
I hope this information can help you.