Correct Answer: (b) Garnet
Solution:Metamorphic rocks are a result of a transformation of existing rock, in a process called metamorphism, which means "change in form". Metamorphic minerals are those that form only at the high temperatures and pressures associated with the process of metamorphism. These minerals, known as index minerals, include sillimanite, kyanite, staurolite, and alusite and some garnet. Other minerals, such as olivines, pyroxene, amphibole, mica, feldspar, and quartz may be found in metamorphic rocks, but are not necessarily the result of the process of metamorphism. Garnet is concerned with metamorphous rocks