Volcanoes Form Above Subduction Zones Because ________

Volcanoes form above subduction zones because ________.

A) the subducting lithosphere melts as it descends and the magma rises to form volcanoes
B) the lithosphere thickens above the subducting lithosphere and causes volcanoes to form
C) the asthenosphere is displaced by the subducting lithosphere and rises to the surface to form volcanoes
D) water is squeezed out of the subducting slab and the water triggers melting of the overlying asthenosphere