As the population in a small town grows, a new water treatment plant is built. The plant is built on a local river where it can release treated water. The treated water is released downriver from the town. The town also gets its drinking water from further up the river.

How might the new treatment plant affect the ecosystem?

A. Treated water from the plant would affect communities downriver.
B. Treated water from the plant would affect communities upriver.
C. Treated water would affect this growing city’s drinking water.