Which of These Is One Reason There Are No Volcanoes

Which of these is one reason there are no volcanoes on Earth anywhere near the size of Olympus Mons?

A) Mars's smaller gravity caused lava to flow more slowly, building up thicker layers as it cooled.
B) Because Mars is smaller than Earth, it retained its interior heat longer and allowed volcanic activity for a longer time.
C) Because of tectonic activity on Earth, volcanoes are subducted too quickly to become large.
D) Because of colder temperatures on Mars, lava solidified more quickly before it had time to move far from the volcanic cone.