An iron bar can be made magnetic when a. its magnetic domains line up . b. it rotates it poles to line up with another magnet. c. it spins it's electrons in different directions.

I think the correct answer from the choices listed above is option A. An iron bar can be made magnetic when its magnetic domains line up.  These magnets are called ferromagnet which has unpaired electrons. In the absence of an applied field, the magnetic moments of the electrons in the material spontaneously line up parallel to one another.

You know how the first one if filled up like the objects do the same but with the other categories

2.00 is the !