Three moles of an ideal gas $C_P=\frac{7R}{2}$at pressure $P_A$and temperature $T_A$ is isothermally expanded to twice its initial volume. It is then compressed at constant pressure to its original volume. Finally the gas is compressed at constant volume to its original pressure $P_A$.  The correct P-V  diagram indicating the processes  are

Let the process start from initial pressure$P_A$ , volume $V_A$  and temperature$T_A$ .
 

(i)     Isothermal expansion (PV=constant)  at temperature $T_A$  to twice the initial volume  $V_A$
(ii)    Compression at constant pressure $\frac{P_A}{2}$to original volume  $V_A$ (i.e.V$\infty T$)
(iii)    Isochoric process (at volume $V_A$) to initial condition  (i.e. P$\infty$T)