What Caused the Long, Meandering Scarps (Cliffs) That Can Be

What caused the long, meandering scarps (cliffs) that can be seen on Mercury?

A) volcanic eruptions along crustal faults over hot spots in the mantle
B) crustal movement similar to continental drift on Earth, where plates have pressed against one another
C) shrinking and folding of the planet's surface as it cooled
D) large impacts near the end of the early period of heavy bombardment; the scarps are eroded crater walls