Why Do Magmas Rise Toward Earth's Surface

Why do magmas rise toward Earth's surface?

A) Most magmas are richer in silica than most crustal and upper mantle rocks.
B) Magmas are more viscous than solid rocks in the crust and upper mantle.
C) Magmas are mainly liquid and contain dissolved fluids such as water; most are less dense than the adjacent solid rock.
D) all of the above