Answer:
The correct answer is (c) melanin
Step-by-step explanation:
Argentaffin substances are substances that have the property of being stained brownish-black by silver salts. Melanin is an example of an argentaffin substance that is present in some tissues, including the skin, hair, and certain parts of the brain. Melanin is responsible for giving color to these tissues, and it plays a role in protecting the skin from the harmful effects of the sun's UV rays. Iron, calcium, and copper are not argentaffin substances.