Three copper blocks of masses `M_{1}, M_{2}` and `M_{3}` kg respectively are brought into thermal contact till they reach equilibrium. Before contact, they were at `T_{1}, T_{2}, T_{3} (T_{1} > T_{2} > T_{3}` ). Assuming there is no heat loss to the surroundings, the equilibrium temperature T is (s is specific heat of copper)

Options

A. `T = (T_1+T_2+T_3)/3`
B. `T = (M_1T_1+M_2T_2+M_3T_3)/(M_1 + M_2 + M_3)`
C. `T = (M_1T_1+M_2T_2+M_3T_3)/(3(M_1 + M_2 + M_3))`
D. `T = (M_1s+ T_1+M_2T_2s+M_3T_3)s/(3(M_1 + M_2 + M_3))`