Which of the following statements describes a consequence of gold and siver mining that affected indigenous people in the mid-1800s?

a. Piows needed for gold and silver mines destroyed native grasses
b. The citting down of timber for gold and silver mines led to a decrease in forests.
c. Debris from gold and siver mines polluted the supplies of drinking water.
d. Fences needed for goid and silver mines limited the movement of wild game.