In the diagram shown, the difference in the two tubes of the manometer is 5 cm, the cross-section of the tube at A and B is 6 mm$$^2$$ and 10 mm$$^2$$ respectively. The rate at which water flows through the tube is (g = 10 m s$$^{-2}$$)

A

7.5 cc s$$^{-1}$$

B

12.5 cc s$$^{-1}$$

C

8.0 cc s$$^{-1}$$

D

10.0 cc s$$^{-1}$$