The four strokes of the diesel cycle take place over:

The correct response indicates that the four strokes of the diesel cycle occur over a 720 degrees rotation of the crankshaft. This is due to the nature of a four-stroke engine, in which each complete cycle consists of intake, compression, power, and exhaust strokes.

In a four-stroke cycle, it takes two complete rotations of the crankshaft to complete all four strokes. Since one full rotation equals 360 degrees, two rotations total 720 degrees. This means that each stroke corresponds to half a rotation of the crankshaft, and collectively, all four strokes necessitate the movement of 720 degrees to cycle through all processes effectively.

Thus, understanding that the diesel engine operates using this four-stroke mechanism clarifies why 720 degrees is the correct context for the operation of the engine in question.