The Diagram Shows a Pipe of Uniform Cross Section in Which

Multiple Choice

The diagram shows a pipe of uniform cross section in which water is flowing. The directions of flow and the volume flow rates (in cm³/s) are shown for various portions of the pipe. The direction of flow and the volume flow rate in the portion marked A are:

A) $\downarrow$ and 3 cm³/s
B) $\uparrow$ and 7 cm³/s
C) $\downarrow$ and 9 cm³/s
D) $\uparrow$ and 11 cm³/s
E) $\downarrow$ and 15 cm³/s