Many of the Islands of Indonesia (Java,Sumatra,Borneo),which Are Located Adjacent

Multiple Choice

Many of the islands of Indonesia (Java,Sumatra,Borneo) ,which are located adjacent to a subduction zone next to the edge of the continental shelf of SE Asia,consist of felsic lava.This means that the lava which produces these islands is derived from

A) a midocean ridge.
B) a volcanic hot spot under the ocean floor.
C) the melting of continental shelf material along with ocean floor material.
D) the melting of subducted plate material and nothing else.
E) a rift zone.