A molecular solid coexists with its liquid phase at its melting point. The solid-liquid mixture is heated, but the temperature d
oes not change while the solid is melting. The best explanation for this phenomenon is that the heat absorbed by the mixture:
A. is lost to the surroundings very quickly
B. is used in overcoming the intermolecular attractions in the solid
C. is used in breaking the bonds within the molecules of the solid
D. causes the nonbonding electrons in the molecules to move to lower energy levels
