The "Ring of Fire" Is the Source of More Earthquakes

The "ring of fire" is the source of more earthquakes and volcanic activity than any other place on earth. What causes the ring of fire?

A) the subduction of Pacific plates under continental plates
B) the drift of Europe and Africa away from the Americas
C) the collision of two continental plates
D) mid-oceanic ridges
E) the conduction currents in the hot magma.