The correct answer is D.
Dams can be used to manage floods by storing water during periods of high rainfall and releasing it slowly during periods of low rainfall. This can help to prevent flooding downstream.
Dams can also be used to provide irrigation by storing water and then releasing it slowly into canals or other watercourses. This can help to irrigate crops during periods of drought.
Dams can also be used to generate hydropower by using the flow of water to turn turbines. This can generate electricity, which can be used to power homes and businesses.
In addition to these three main benefits, dams can also be used for other purposes, such as recreation, water storage, and fish and wildlife management.