Answer:
Thermal energy.
Explanation:
Thermal energy is related to heat of the system, so higher the heat in the system more the thermal energy and this will cause more movement. In case of less thermal energy, less movement and hence more attractions.
A) specific heat : it is the heat required to raise the temperature of one unit of a substance by one degree.
B) Heat is not a property of system. It is given and taken out from the system which changes its temperature and thermal energy.
C) Temperature is measurement of heat.