The picture shows the Kerr Dam in Montana.

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While dams are useful to the human population in an area, what can be a negative impact of the dam on the local environment?

A.
The air quality declines, as the water no longer filters toxins from the air that flows across the river.

B.
Acid rain is released, triggering all the chemicals in the river to collect near the dam and evaporate into clouds.

C.
Deforestation occurs, as the trees downstream are no longer watered by the river, and they all die.

D.
The flow of water is altered, flooding the habitats upstream and drying up the land below the dam.