The Lunar Highlands Are Made Mostly of Rocks That

The lunar highlands are made mostly of rocks that

A) fell on to the Moon from space
B) were recently expelled by volcanoes from the deep interior of the Moon
C) rose to the top as the Moon cooled from a molten state early in its history
D) that were pushed upwards due to active plate tectonics on the Moon
E) don't have a good scientific explanation yet
Section 9.3: Impact Craters