The Thermal Energy of a Block of Ice At $0^{\circ} \mathrm{C}$

The thermal energy of a block of ice at $0^{\circ} \mathrm{C}$ melting to a puddle of water at $0^{\circ} \mathrm{C}$ in a cup at room temperature

A) Increases.
B) Decreases.
C) Remains the same.