I think A. Otherwise you would have to wait some time for an answer to be written down.
Answer:
try mixing the first question and last question if that helps but none of these will be perfect because they hold different points
Answer:
The electromagnets are the magnets which shows magnetic properties when the electric current pass through them. They are temporary magnets, they can be turned on or off when desired. Moreover, large amounts of scrap steel can be moved easily from one place to another with electromagnets.
HOPE IT HELPS!