A cylindrical drum, open at the top, contains `30` litres of water. It drains out through a small opening at the bottom. `10` litres of water comes out in time `t_1`, the next `10`litres in a further time `t_2` and the last `10` litres in a further time `t_3` Then,
A. `t_(1) = t_(2) = t_(3)`
B. `t_(1) gt t_(2) gt t_(3)`
C. `t_(1) lt t_(2) lt t_(3)`
D. `t_(2) gt t_(1) = t_(3)`
