You are given a science question (easy-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
Q: Minerals are used for making many things including jewelry, chalk, and concrete. Where do we get the minerals needed to make these things?
(A) from air (B) from wood (C) from rocks (D) from crops
A:
C