pyq/2016/csat/73

A cylindrical overhead tank of radius 2 m and height 7 m is to be filled from an underground tank of size 5.5 m × 6 m. How much portion of the underground tank is still filled with water after filling the overhead tank completely?

(A) 1/3

(B) 1/2

(C) 1/4

(D) 1/6