Granite is a type of igneous rock. what determines the size of the crystals that form in a sample of granite?
a. how many times those minerals have been in granite before
b. how quickly the rock cooled
c. how large the sample is
d. how many impurities are in the granite

These minerals are quartz, feldspar, mica, and usually hornblende. Granite forms as magma cools far under the earth's surface. Because it hardens deep underground it cools very slowly. This allows crystals of the four minerals to grow large enough to be easily seen by the naked eye

Explanation:

Minerals from Igneous rocks are always or sometimes went through lava as magma and cooled