Concept:The point where an earthquake originates inside the Earth is called the focus or hypocenter.
Explanation:The focus is the exact location within the Earth where the rupture first occurs and seismic waves are released.
It is also known as the hypocenter.
The epicenter is the point directly above the focus on the Earth’s surface.
Scientists locate the epicenter by drawing arcs from three or more seismic stations; the intersection of these arcs gives the epicenter.
The photosphere is the visible surface of the Sun, not related to earthquakes.
A seismic zone is a region where earthquakes often occur, while a seismic hazard zone describes the level of risk from earthquakes.
Thus, the point of origin of an earthquake wave is correctly termed the focus.
Answer:B. Focus