Question

1. a bar or mass of steel or iron that has the property of attracting certain substances, like iron

a. nickel b. magnet c. repel d. core

Explanation:

A magnet is a material (like steel or iron) that can attract certain substances (such as iron). Nickel is a metal but not described as having the property of attracting iron - like substances in this context. "Repel" is a verb meaning to push away. "Core" refers to the central part.

Answer:

B. magnet