Answer is C; volume stays the same (always) but the shape will change (to take of the space of the container).
Doctoral or professional degree
Median pay (annual): 121,500 USD (2015)
Projected 10-year growth: -3% (2019), 3% (2014)
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About 50% is absorbed by Earth's surface, about 25% is reflected by clouds, dust, and gases in the atmosphere, about 20% is absorbed by gases and particles in the atmosphere and about 5% is reflected by the surface back into the atmosphere.
I believe it's A. Covalent Bonding