Identify the graph(s) which satisfies the given conditions.
I) $\mathrm{W}=-{\int }_{{\mathrm{V}}_{\mathrm{i}}}^{{\mathrm{V}}_{\mathrm{f}}} {\mathrm{p}}_{\mathrm{ext}}\mathrm{dV}$
II) It is reversible process.
III) W = -2.303nRTlog(V_f /V_i) 
Work done is represented by the shaded area.

magnitude of work done is given by the area under curve in P-V diagram

reversible process is a process in which driving and opposing forces differ by negligible amount.

work = -2.303nRT$\log \frac{{\mathrm{V}}_{\mathrm{f}}}{{\mathrm{V}}_{\mathrm{i}}}$