Which Statement Best Describes the Development of Mining Throughout the West

Which statement best describes the development of mining throughout the West?

A) Westerners adapted Indian practices to meet their own needs.
B) Most boomtowns adapted to the changing economy and became stable places of commerce.
C) Mining was an environmentally friendly activity that helped the West preserve its natural beauty.
D) Mining required a large amount of expensive technology, financed by outside capital.