Which is not a characteristic of vitamins?

Hello. This question is incomplete. The full question is:

"Which is not a characteristic of vitamins?

A. They occur naturally in rocks and minerals.  B. They are made by living things.  C. They assist in many chemical reactions in the body.  D. They are required by the body in small amounts"

A. They occur naturally in rocks and minerals.

Explanation:

Vitamins are organic compounds not synthesized by the body, being incorporated through food. They are essential for the functioning of important biochemical processes in the body, especially as catalysts for chemical reactions.

The main sources of vitamins are fruits, vegetables, legumes, meat, milk, eggs and cereals. They do not occur naturally in rocks and minerals.

theres nothing above

c would be the answer