The Granite Plutons of the Sierra Nevada Mountains of California

The granite plutons of the Sierra Nevada Mountains of California formed because ____.

A) a continental-continental collision caused melting of the North American plate.
B) subduction of an oceanic plate beneath the North American continent produced granitic magmas that cooled deeper in the crust.
C) the San Andreas strike-slip fault caused melting of the North American plate.
D) there was no plate boundary near western North America.
E) volcanoes spewed forth huge amounts of granite.