Which of the following is a ferromagnetic magnetic material? a) diamond b) aluminum c) copper d) iron

D) iron

Explanation:

Iron, nickel, cobalt and some of the rare earths (gadolinium, dysprosium) exhibit a unique magnetic behavior which is called ferromagnetism because iron (ferrum in Latin) is the most common and most dramatic example. ... There are many practical applications of ferromagnetic materials, such as the electromagnet.

well

explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.