Why is the “Ring of Fire significant in the
study of geology?
A It is the area where all of the world's mountains are found.
B. It is the area where the Earth's plate boundaries are most
active.
C. It is the area where most of the world's forest fires take
place.

B. It is the area where the Earth's plate boundaries are most active.

Explanation:

The Ring of Fire is curve where many volcanoes erupt and earthquakes occur. It is located around the Pacific Ocean.

The only option that makes sense is:

B. It is the area where the Earth's plate boundaries are most  active.