P-V diagram of a cyclic process ABCA is as shown in the given figure. Choose the correct alternative.

During process AB pressure and volume both are decreasing. Therefore, temperature and hence internal energy of the gas will decrease (T∝PV) or ΔUA→B=negative. Further, ΔWA→B is negative.In process B to C, pressure of the gas is constant while volume is increasing. Hence, temperature should increase or ΔUB→C = positive. During C to A volume is constant while pressure is increasing. Therefore, temperature and hence internal energy of the gas should increase or ΔUC→A= positive. During process CAB, volume of the gas is decreasing. Hence, work done by the gas is negative.