The V-shaped valley can be generated when:
a. the rate of downcutting by stream is much slower than mass movement on the walls
b. downcutting by stream happens as fast as mass movement on the walls
c. the rate of downcutting by stream is much faster than mass movement on the walls
d. downward erosion is less dominant
Answer: b. downcutting by stream happens as fast as mass movement on the walls
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