A watershed is .
A. a river that drains into the sea
B. a term used to describe water stored underground the water
C. held in the atmosphere prior to returning to Earth in the form of rainfall
D. the area of land that drains into a river or lake an inland basin that connects to another inland basin

the area of land that drains into a river or lake an inland basin that connects to another inland basin (D)

Explanation:

A watershed is an area of land which contains common rivers and streams that drain into a larger body of water like an ocean, lake or larger river. Watershed can either cover a small or large area.

Every streams flowing into small or larger rivers, and then into the ocean, develop a network of waterways. For example, Mississippi River watershed is a large watershed. Every tributaries to the Mississippi which collect rainwater drain into the Mississippi and it also drains into the Gulf of Mexico eventually.

D. the area of land that drains into a river or lake

Explanation:

Watershed is also called a drainage basin. It is the area of land which contains surface water. This drains into water bodies such as the river or lake.

Watershed is beneficial as it helps in differentiation and preservation of water by emptying itself into the bodies. As a result the water in the water bodies from the watershed are used for irrigation in Agriculture and as a source of water for other activities.