Question

how does a rock change into a metamorphic rock?
evaporation
heat and pressure
cementation and compaction
cooling of magma

Explanation:

Metamorphic rocks form when existing rocks (igneous, sedimentary, or other metamorphic) are subjected to high heat and pressure. This causes physical and chemical changes in the rock's minerals and texture. Evaporation is related to water turning to vapor (not rock formation). Cementation and compaction are processes in sedimentary rock formation. Cooling of magma forms igneous rocks.

Answer:

heat and pressure