An Ideal Monatomic Gas Expands Isobarically from State a to State

An ideal monatomic gas expands isobarically from state A to state B. It is then compressed isothermally from state B to state C and finally cooled at constant volume until it returns to its initial state A.

-How much work is done on the gas in going from B to C?

A) 2.5 × 10⁶ J
B) 5.5 × 10⁶ J
C) 4.5 × 10⁶ J
D) 6.5 × 10⁶ J
E) 8.0 × 10⁶ J