A certain water pump rated 500 watt lifts water from ground level to a height $$h=10\text{ m}$$ at a rate of 240 $$\mathrm{kg}$$ per minute. Ignoring kinetic energy, the efficiency of the water pump is

A

74.8 $$\%$$

B

78.4 $$\%$$

C

84.7 $$\%$$

D

87.4 $$\%$$