Martian Volcanoes Are Larger Than Volcanoes on Earth Because

Martian volcanoes are larger than volcanoes on Earth because

A) Mars's weaker gravity makes it easier for tall structures to be built up.
B) the lack of plate tectonics on Mars means that mantle plumes remain stationary relative to the surface, building up huge, single mountains.
C) Mars has more internal heat than the Earth so volcanoes naturally grow to much larger sizes
D) Both A and B