As shown in the figure, the curve in the figure is an isotherm. Starting from the point on the right (volume V 1), do isobaric decompression without doing work, then do isobaric compression to reduce the volume to a very low level, far below V2, do negative work, then do isobaric boosting, the pressure rises to the same level as the final state, and then do isobaric expansion without doing work, and do positive work.

Because work is equal to the area, the pressure is extremely low when doing negative work, so the work is extremely small, which can ensure that positive work is greater than the absolute value of negative work and the total work is positive.

D is right, because work can be positive and the corresponding heat is also positive.