d
Change in internal energy is path independent and depends only on the initial and final states.

As the initial and final states in the three processes are same. Therefore,

\(\Delta {u_1} = \Delta {u_2} = \Delta {u_3}\)

Workdone, \(W=Area\,under\,P-V\,graph\)

As area under curve \(1>\) area under curve \(2>\) area under curve \(3\)

\(\therefore {W_1} > {W_2} > {W_3}\)

According to first law of thermodynamics,

\(Q = W + \Delta u\)

\(As{W_1} > {W_2} > {W_3}\,and\,\Delta {u_1} = \Delta {u_2} = \Delta {u_3}\)

\(\therefore {Q_1} > {Q_2} > {Q_3}\)