How Does Glaciation Affect Volcanism

How does glaciation affect volcanism?

A) Volcanoes become less active during glacial times, because temperatures are cooler.
B) Volcanoes become less active during glacial times, because they are covered with ice.
C) Volcanism and glaciation have not been shown to have a causal relationship to each other.
D) Volcanoes become more active as heat is trapped in Earth.
E) Volcanoes become more active in order to end the glaciation.