Suppose We Had a Device That Allowed Us to See

Suppose we had a device that allowed us to see Earth's interior.If we looked at a typical region of the mantle,what would we see happening?

A) not much-on human time scales,the mantle looks like solid rock
B) hot molten rock rising upward throughout the mantle and cool,solid rock falling downward
C) a rapid,up-and-down churning of the material in the mantle
D) dense metals falling downward while low-density rock rises upward