Stagnant water in a swamp is not an example of a watershed.
Hydrographic basin also known as Watershed is a term to refer to the territory through which water is naturally drained into the sea or another river. The watersheds are made up of three parts called the upper basin, the middle basin and the lower basin.
The largest river basins in the world are the Amazon basin which has an area of about 6.1 million km², the Congo basin which has an area of about 3.3 million km² and the Nile basin which has a area of about 3.2 km².
Based on the above, options A. A river flowing into the ocean, B. A small stream that drains into a larger river, and C. Runoff from recipitation that drains into a stream, are examples of watersheds because the water runs from form that is draining into another source. While stangnant water does not drain any water.
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