Context: This is a piece of gneiss. Gneiss is a rock made of minerals such as biotite and garnet. The minerals in gneiss are often arranged in bands.
Gneiss can form when a rock is changed by high temperature and pressure. Gneiss is often found deep inside the Earth's crust.
What type of rock is gneiss?
A. metamorphic
B. sedimentary
C. igneous
Select the correct answer from the given choices and respond with the letter of the chosen option.

A