Volcanoes Form Above Subduction Zones Because_______

Volcanoes form above subduction zones because_______ .

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