You are correct if you assume that some or most of the ice is forced under water by the weight of the ice above it. It will then displace more water than it weighs. a is correct.
As the ice melts, the volume will decrease, but you will still have the same mass of water. Therefore d and e are right out.
b would be correct if there was a small amount of ice floating freely in the water, as Yakk suggested with his ship analogy.
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