A Hydroelectric Power Plant Generates Electricity from Water Falling a Height

A hydroelectric power plant generates electricity from water falling a height of h m and at a rate of 20,000 kg/s.If the theoretical maximum power output of the plant is 15.0 MW what is the height h?

A) 750 m
B) 153 m
C) 102 m
D) 76.5 m
E) 38.3 m