Which option correctly describes an effect of human activity on a river channel?
A) If logging and clearing have increased the sediment load, the channel may fill and the banks may become higher.
B) If logging and clearing have increased the amount of runoff, the channel may fill and the banks may become higher.
C) If agriculture and building have decreased the amount of runoff, the channel may erode further and the banks will become lower.
D) If agriculture and building have increased the sediment load, the channel may erode further and the banks will become lower.
Answer: A
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