Bar a Has One End Painted Green and the Other

Bar A has one end painted green and the other end red and may or may not be a magnet. A student brings the north pole of a bar magnet M close to the green end of A. He observes that the green end is attracted. He can conclude that

A) A is not a magnet.
B) A is a magnet and the green end is a north pole.
C) A is a magnet and the green end is a south pole.
D) A might be a magnet; this observation does not provide enough information to determine whether or not it is.