A Geologist Looks at a Piece of Rock from Yosemite

A geologist looks at a piece of rock from Yosemite National Park under a microscope and sees tiny crystals of olivine, pyroxene, and plagioclase feldspar. What process might have formed this rock?

A) melting underground, violent volcanic eruption, and solidification above ground
B) melting underground, flowing to Earth's surface, and solidification above ground
C) solidification underground, violent volcanic eruption of ash and solid rock
D) both melting and crystallization underground