Where Do Most Earthquakes Occur near Mid-Ocean Ridges

Where do most earthquakes occur near mid-ocean ridges?

A) at great depths more than 100 km)
B) along the axis of the ridge and on transform faults that connect ridge segments
C) in the asthenosphere where mantle undergoes decompression melting
D) on the boundary between the mantle and the oceanic crust
E) all of these