A steam engine develops 600 kW at 180 r.p.m. The coefficient of fluctuation of energy is found to be 0.5 and the fluctuation of speed is required to be kept within ±1% of the mean speed. The maximum fluctuation of the energy during operation is given by:

• A. 150 kN-m
• B. 50 kN-m
• C. 100 kN-m
• D. 120 kN-m