When a stream is flowing rapidly and its gradient is steep , downcutting is rapid

1.When a stream is flowing rapidly and its gradient is steep , downcutting is rapid .
The result is Select one :
a . typically a gentle – sided valley , V – shaped in cross section , and relatively straight .
b . typically a steep – sided valley , V – shaped in cross section , and relatively straight .
c . typically a gentle – sided valley , U – shaped in cross section , and relatively straight .
d . typically a steep – sided valley , U – shaped in cross section , and relatively straight .
O e . typically a steep – sided valley , V – shaped in cross section , and relatively sinuous .

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