A watershed, or drainage basin, is a region of land where rain or snow drains downhill into a body of water, such as a river, lake, sea, ocean or wetland. The water in drainage basins is most likely used
A.
in developed areas for irrigation and cooking.
B.
in large cities for plumbing and sewage.
C.
by humans for drinking and bathing.
D.
by plants and animals as a source of water.