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