Final answer:
Meandering is an important geographical feature of rivers and streams as it slows down the water in a stream, particularly because of resistance and increased turbulence near the shore and changes in the river channel's shape.
Step-by-step explanation:
Meandering refers to the winding pattern that a river or stream can take. It is important because it slows down the water in a stream. This reduction in water speed is due to various factors, including the resistance between the water and the shore, the resistance between fluid layers, and increased turbulence near the shore. As the river widens and the gradient decreases, the current slows, sedimentation increases, and temperature can also rise due to longer exposure to sunlight and other factors. An example of a natural feature that can slow water is a reservoir, where the water speed decreases as the cross-section area increases and then picks up speed again as it exits into a narrower part. Therefore, in the context of the question, the correct answer is option C).