Water Is Pumped into One End of a Long Pipe

Multiple Choice

Water is pumped into one end of a long pipe at the rate of 40 L/min.It emerges at the other end at 24 L/min.A possible reason for this decrease in flow is:

A) the water is being pumped uphill
B) the water is being pumped downhill
C) the diameter of the pipe is not the same at the two ends
D) friction in the pipe
E) a leak in the pipe