An Ideal Monatomic Gas Expands Isothermally from State a to State

An ideal monatomic gas expands isothermally from state A to state B.The gas then cools at constant volume to state C.The gas is then compressed isobarically to D before it is heated until it returns to state A.

-What is the ratio of the internal energy of the gas in state C to that in state A?

A) 2/1
B) 1/2
C) 130/327
D) 240/600
E) 600/240