Humans have negatively impacted the water system of Arkansas in the following ways:
b. Chemicals and runoff from industry harm wildlife.
c. Too much trade along the rivers damages the banks.
d. Sediment from hydroelectric dams can pollute waters.
Option a, while it may have some truth, is less commonly cited and is more specific in context. The primary negative impacts relate to pollution, trade, and sedimentation as detailed above.