A pump installed on a wall can pump at a maximum rate of 100 gallons per minute. If the pump runs at 50% of its maximum rate for six hours a day, how much water is pumped in one day?

A. 3.00 x 10^2 gallons
B. 1.80 x 10^4 gallons
C. 3.60 x 10^4 gallons
D. 7.20 x 10^4 gallons