Context: Granite forms through the cooling of melted rock. It is made of minerals such as quartz and biotite. Quartz is a light-colored mineral, and biotite is a dark-colored mineral.
Here are two pieces of granite. Do you see the mineral grains in the two rocks? The darker rock has more biotite than the lighter rock.
What type of rock is granite?
A. sedimentary
B. igneous
C. metamorphic
Select the correct answer from the provided options and reply with the letter associated with it.

B