Correct Answer - A
(a) Heat given to system =`(nC_VDeltaT)_(AtoB)+(bC_PDeltaT)_(BtoC)`
`=[3/2(nRDeltaT)]_(AtoB)+[5/2(nRDeltaT)]_(BtoC)`
`[3/2xxV_0DeltaP]_(AtoB)+[5/2xx2P_0xxV_0]`
`=13/2P_0V_0`
and `W_0=P_0V_0`
`eta=Work/(heat given)=(P-0V_0)/(13/2P_0V_0)xx100=15.4%`