What does the total thermal energy of a system depend on?

The correct answer is - temperature, state of molecules, and the number of molecules.

Explanation:

The total thermal energy of a system or the total internal energy of a system solely depends on three major aspects of the system's or objects that are the number of molecules or atoms in the system, the temperature of the system, and the state or arrangement of the molecules of the system. More the molecules or atoms present in a system at a particular temperature higher the total thermal energy the system has.

Thus, the correct answer is - temperature, state of molecules, and the number of molecules.