Why Are Continent-Continent Collision Zones Not Associated with Volcanism

Why are continent-continent collision zones not associated with volcanism?

A) They are not located at the plate boundaries.
B) They are relatively distant from the liquid outer core,which is a magma source.
C) There is sliding between continents,which act as a lid
D) The continental rock stacks into extra-thick masses,which act as a barrier to rising magma
E) None of the choices are correct