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Water increases volume when it freezes into ice. That's why ice floats. It's less dense.
Fill a pitcher with ice and water. If some of the ice is forced to completely submerge due to the weight of more ice above it, then those cubes will displace more water than the water needed to make the ice in the first place. When they melt, they no longer displace a greater volume.
a is correct in this case.
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