What type of rock cannot be changed into a metamorphic rock?

A) sedimentary

B) igneous

C) metamorphic

D) magma

D is your answer

Any rock, be it igneous, sedimentary or metamorphic, can be changed into a metamorphic rock through increased pressure and/or temperature. Any rock, be it igneous, sedimentary or metamorphic, can be changed into a metamorphic rock through increased pressure and/or temperature. Minor edit? SaveCancel.

Metamorphic rock can change into igneous or sedimentary rock. Igneous rock forms when magma cools and makes crystals. Magma is a hot liquid made of melted minerals. The minerals can form crystals when they cool.

so is C) metamorphic