A venturimeter. of 20mm throat diameter is used to measure the velocity of water.in a horizontal pipe of 40mm diameter. If the pressure difference between the pipe and throat sections is found to be 30 kPa, then, neglecting frictional losses, the flow velocity is

A

0.2 m/sec

B

1.0 m/sec

C

1.40 m/sec

D

2.0 m/sec