Temperature is directly proportional to the average kinetic energy of the molecules.
KE = 3/2 kT ...... where KE is the average kinetic energy of a molecule and k is Boltzmann's constant (1.381x10^-23 J/K).
KE = 3/2 RT ...... where KE is the average kinetic energy for a mole of molecules and R is the gas constant (8.314 J/molK).
Therefore, as KE decreases, T decreases and it gets cooler.
It gets cooler...as metal gains energy it becomes hotter and melts...
**The correct answer is C