An ideal gas is initially at P1, V1 is expanded to P2, V2 and then compressed adiabatically to the same volume V1 and pressure P3. If W is the net work done by the gas in complete process which of the following is true
(A) W > 0 ; P3 > P1
(B) W < 0 ; P3 > P1
(C) W > 0 ; P3 < P1
(D) W < 0 ; P3 < P1