The Huge Volcano Olympus Mons on Mars and Those That

Multiple Choice

The huge volcano Olympus Mons on Mars and those that make up the Hawaiian Islands on Earth appear to be very similar,but they differ in one important respect.What is this difference?

A) Olympus Mons is very close to the Martian north pole,where tidal stress from the Sun is small,whereas the Hawaiian Islands are close to the equator,where tidal stresses from the Moon and Sun have formed the fault along which they lie.
B) Olympus Mons is formed almost solely of sulfur,whereas the Hawaiian Islands are formed of rock from the solidification of lava.
C) Olympus Mons is a very steep-sided volcano,whereas the volcanoes of Hawaii are rather flat,with gentle slopes right up to their calderas.
D) In the Hawaiian Islands,plate tectonic motion has moved the Pacific Ocean floor over a hot spot,forming a line of volcanoes.No such motion occurred for Olympus Mons over an equivalent hot spot on Mars.