To determine which p-V curve represents maximum work done, we need to analyze the area under each curve.$\\$The work done by a gas during expansion or compression is given by the area under the p-V curve.$\\$Let's evaluate each option:$\\$• Option 1: The curve is a closed loop, indicating a cyclic process. The net work done is the area enclosed by the loop.$\\$• Option 2: The curve is a downward-sloping isothermal process. The area under this curve is significant, as it represents work done during expansion.$\\$• Option 3: The curve is a vertical line, indicating no change in volume. Hence, no work is done.$\\$