Final answer:
Heat is the correct answer as it is the transfer of energy between objects due to a temperature difference, with energy moving from a hotter to a colder object until both reach the same temperature.
Step-by-step explanation:
Among the options provided, Heat is the transfer of energy from one object to another due to a difference in temperature. This energy transfer occurs because when two objects at different temperatures are in contact, energy flows from the hotter object to the colder one until they are at the same temperature. The fundamental equation for the transfer of heat that leads to a change in temperature (ΔT) for an object with mass (m) is Q = mcΔT, where Q is the heat transferred, m is the mass, ΔT is the change in temperature, and c is the specific heat of the material.