What happens when a, certain quantity of pure ice is completely changed to water at 0^oC?

• A.latent heat is absorbed, the mass remains constant, and the volume decreases
• B.latent heat is given out, the mass remains constant and the volume decreases
• C.latent heat is given out, the mass increases and the volume remains constant
• D.latent heat is absorbed, the mass decreases and the volume increases
• E.