Two Moles of a Confined Ideal Monatomic Gas Begin at State

Two moles of a confined ideal monatomic gas begin at state A on the pressure-volume graph and follow the path shown to state D.If the temperature of the gas at A is 54 K, what is the temperature of the gas at D?

A) 32 K
B) 46 K
C) 54 K
D) 60 K
E) 78 K