What Was One of the Primary Results from the Hubbard

What was one of the primary results from the Hubbard Brook Watershed Project?

A) Deforestation increases flooding.
B) New plant species that absorb less water were discovered.
C) Pollution gravely affected the water supply.
D) Primary consumers are the most important part of the energy pyramid.
E) Trees absorb too much water and are not useful in a watershed area.