Two equal mass objects $($which are in thermal contact$)$ make up a system that is thermally isolated from its surroundings. One object has an initial temperature of $100$C and the other has an initial temperature of $0$C$.$ What is the equilibrium temperature of the system, assuming that no phase changes take place for either object? $($The hot object has a specific heat capacity that is three times that of the cold object.$)$

A$)75$C

B$)25$C

C$)23$C

D$)50$C

E$)19$C