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) " $\downarrow$ 15 cm³/s"