At Position a Within a Tube Containing Fluid That Is

At position A within a tube containing fluid that is moving with steady laminar flow, the speed of the fluid is 12.0 m/s and the tube has a diameter 12.00 cm. At position B, the speed of the fluid is 18.0 m/s and the tube has a diameter 6.00 cm. What is the ratio of the density of the fluid at position A to the density of the fluid at position B?

A) 3.00
B) 0.167
C) 0.375
D) 0.333
E) 0.750