SAT US History Practice Question

In the second half of the 19th century, mining went from being an endeavor dominated by individual prospectors to one dominated by a few large corporations because

1. A.the children of prospectors lost interest in mining and sold their operations to corporations.
2. B.insurance and licensing fees were beyond the reach of most individuals.
3. C.the machinery required for extracting ore cost more than most prospectors could afford.
4. D.the transportation costs of shipping ore became too great for individual prospectors.
5. E.most of the prospectors were drafted into the Union army during the Civil War.