A Glass Tube Has Several Different Cross-Sectional Areas with the Values

Multiple Choice

A glass tube has several different cross-sectional areas with the values indicated in the figure. A piston at the left end of the tube exerts pressure so that mercury within the tube flows from the right end with a speed of 8.0 m/s. Three points within the tube are labeled A, B, and C.
-What is the total pressure at point B?

A) 1.01 × 10⁵ Pa
B) 3.64 × 10⁴ Pa
C) 4.27 × 10⁵ Pa
D) 6.44 × 10⁴ Pa
E) 7.45 × 10⁴ Pa