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Question
Identify A, B, C and D; first one is done for you.

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Solution
(A) Latent heat of fusion: The latent heat of fusion is the amount of energy required to convert a solid to a liquid at atmospheric pressure and melting point.
(B) Latent heat of vaporization: The latent heat of vaporization is the heat energy necessary to convert a liquid to a gas at atmospheric pressure and boiling point.
(C) Latent heat of condensation: The latent heat of condensation is the amount of heat released when a gas is converted to a liquid at atmospheric pressure and boiling point.
(D) Latent heat of solidification: The latent heat of solidification is the heat energy released when a liquid transforms into a solid at atmospheric pressure and melting point.
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