A venturimeter of 20 mm throat diameter is used to measure the velocity of water in a horizontal pipe of 40 mm 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/s (b) 1 m/s
(c) 1.4 m/s (d) 2.0 m/s