The most common mineral forming process?

C. Crystallization of magma

Explanation:

From the given options, the most common mineral forming process is "crystallization of magma".

When there is an eruption and the magma rises to the earth's surface, it forms a lava. Then the lava begins to cool and crystallize to form igneous mineral rocks. During the crystallization process, it forms crystals.

This process is a common mineral forming process.