Question

2 Points

Answer 1

Answer:

C

Explanation:

Option C seems the most likely. Large dams came much later, so option B can immediately be ruled out. The end of the California gold rush also came later, and settlers were not forced to stop and settle along the trail, so option A can also be ruled out. Option D can also be ruled out, because if there were farmers already on the plains it means they must already have been settled.