The right answer is B. act as a drainage area.
A watershed or watershed is the space drained by a watercourse and its tributaries. All the waters that fall into this space converge towards the same exit point called an outlet: stream, lake, sea, ocean, etc.
The watershed is bounded by a watershed that often corresponds to the ridge lines but not always. Generally a watershed develops beyond the ridge lines. A watershed is a divergent line of slopes. Rainwater on both sides of this line flows in two different directions, carrying with them dissolved or suspended elements such as sediments and pollution.
The correct answer is B. acts as an drainage area.
A watershed is surface area on land where all the rain water collected and drained through a common point into a water bodies such as river, lake or stream. A watershed is also called a drainage basin or catchment area. Watersheds conserve water and make river, streams flow uninterrupted. It recharges ground water and provide dwelling place for wildlife and plants.
