During the formation of metamorphic rocks, what most likely causes pressure to increase?

Question

Magma pockets rise.
Gravity pulls on rocks.
Rocks melt deep beneath Earth’s surface.
Rocks beneath Earth’s surface are forced toward the mantle.

Answer 1

During the formation of metamorphic rocks, the factor that most likely causes pressure to increase is gravity pulls on rocks. As sedimentary or igneous rocks are buried deeper beneath the Earth's surface due to geological processes, the weight of the overlying material increases the pressure on these rocks, leading to metamorphism.