The correct answer is A. 75 kmph.
A 140 ton diesel hydraulic crane is a heavy piece of machinery that is not designed for high speeds. The maximum speed of a 140 ton diesel hydraulic crane is typically around 75 kmph. This is because the crane is designed to be stable and maneuverable at low speeds. If the crane were to travel at a higher speed, it would be more likely to tip over or become unstable.
Option B, 100 kmph, is too high. A 140 ton diesel hydraulic crane would be very unstable at a speed of 100 kmph. It is more likely to tip over or become unstable at this speed.
Option C, 140 kmph, is also too high. A 140 ton diesel hydraulic crane would be very unstable at a speed of 140 kmph. It is more likely to tip over or become unstable at this speed.
Option D, 160 kmph, is the highest speed on the list. However, it is not realistic to expect a 140 ton diesel hydraulic crane to travel at this speed. The crane would be very unstable at this speed and is more likely to tip over or become unstable.