Water flows at a speed of 4.2 m/s through a horizontal pipe of diameter 3.2 cm. Suppose a thick pipe is connected to a thinner pipe. In the first pipe, the gauge pressure p1 of the water is 1.7 atm. The diameter of the smaller section is 2.4 cm. What is the gauge pressure p2 of the water in the thinner pipe?
a. 1.4 atm
b. 2.5 atm
c. 3.1 atm
d. 3.8 atm