A natural, meandering, river channel is modified into a more or less straight and smooth, canal-like channel. Which of the following statements is correct?
A. The straight channel has a higher gradient and more friction than the natural channel.
B. The natural channel had a lower gradient and higher friction than the straight channel.
C. The natural channel had a lower gradient and less friction than the modified channel.
D. All of the above statements are true.
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