11. (4 pts) A centrifugal pump operating at 2000rpm is used to move liquid from a feed tank to a) reactor. At steady state operation, the pump head is 25m and the flow rate of 100m3/h, if the flow rate is decreased to 70m3/h by throttling (keeping the same rotational speed), then the pump head at the new operation point would be [A] less than 25m [B] more than 25m [C] stay the same at 25m [D] unknown