Answer:
Streams (b) with gentle slopes tend to be confined to a single channel rather than being braided.
Step-by-step explanation:
Streams that carry a lot of sediment often result in braided channels due to the increased deposition of sediments, causing the water to split into multiple channels. On the other hand, streams with gentle slopes typically have lower sediment transport capacity. As a result, these streams are more likely to maintain a single channel, as the water can flow smoothly without the excessive sediment load leading to braiding. The gentle slope allows the water to move at a moderate pace, preventing the formation of multiple channels.
Streams composed of glacial meltwaters can also exhibit braiding due to the high sediment load carried by glacial melt. However, the question specifically highlights streams with gentle slopes, emphasizing the role of slope in influencing channel morphology. In summary, the key factor influencing the tendency of streams to be confined to a single channel is the gentle slope, as it promotes smoother water flow and reduces the likelihood of braiding.
Option B is correct.