Removing Too Much Fresh Water from a River

Removing too much fresh water from a river:

A) can cause a river to become devoid of dissolved minerals and salts as there is less water to hold these substances in solution.
B) can cause a decrease in bird populations because of the ensuing water shortage and reduced productivity in the estuarine areas that are breeding grounds for many species.
C) has little effect on associated wetland areas as such areas are naturally adapted to dramatic declines in water levels.
D) actually results in an increase in productivity of associated wetlands and estuaries because the lower water flows carry more nutrients.