I It retains its magnetic much longer than steel.
II It is more easily magnetized than steel
III It is more easily demagnetized than steel
IV It produces a stronger magnet than steel
Which combination of the above makes iron preferable to steel in the making of electromagnets?

• A.I and II only
• B.II and III only
• C.I, III, and IV only
• D.II, III and IV only
• E.