The correct answer is A) True.
Minerals are naturally occurring inorganic substances with a definite chemical composition and crystal structure. They are the fundamental components that make up rocks. When we refer to rocks, we are indeed discussing aggregates of one or more minerals. For example, granite is composed mainly of quartz, feldspar, and mica. Therefore, understanding the relationship between minerals and rocks is essential in geology, as this connection highlights how various minerals combine to form different types of rocks.