iron pipes, steel beams, and other steel structures that remain stationary are often found to be magnetized with a distinct polarity. Explain how this can happen. I dont know the answer can someone help :D

i think it’s a. this is because if they measured the mass of something with a mass of 150g, then their final answer would have to be approximately 150g. though all of their answers are almost 150, rosa and tran have the closest answers (or the exact answer) to the accurate one.