A liquid of density 1200 kg/m$$^3$$ is flowing steadily through a tube of varying cross section as shown below.Thecross section at point A is 1 cm$$^2$$ and at Bis 20 mm$$^2$$. The points A and B are in the same horizontal plane. The speed of liquid at point A is 10 cm/sec. The difference of pressure at A and B is

A

100 Pa

B

170 Pa

C

144 Pa

D

180 Pa