Answer :
C). Metamorphic rocks of the same grade may differ due to variations Different depth within Earth.
Metamorphic rocks of the same grade may differ because of:
- Different temperature: Rocks exposed to different temperatures during metamorphism will exhibit variations in mineral composition and texture.
- Different chemical composition: Rocks with distinct chemical compositions prior to metamorphism will result in different metamorphic rocks.
- Different pressure: Variances in pressure conditions during metamorphism lead to the formation of diverse metamorphic rocks.
The correct option is C.