Which of these best explains what happens when ice melts to form liquid water?

Since the question says "these" I assume it was multiple choice ... but anyways, intermolecular forces between some of the water molecules are breaking apart. The H2O is going from a tightly packed solid of a fixed volume to a liquid with molecules moving faster and less bonds, which can take the shape of its container. It requires energy to break a bond, so this is an endothermic process.