I believe the answer is B :)
D. Bad investments by a large banking firm forced the company to declare bankruptcy. when the banking firm of Jay Cooke and Company, a firm heavily invested in railroad construction, closed its doors on September 18, 1873, a major economic panic swept the nation.
The Dawes Act was introduced by Congressman Henry Dawes of Massachusetts. The idea behind that law was that Indian tribes would be broken up and those who chose to leave their tribes would be granted United States citizenship.
Hope I helped I didn't plagiarism or copy any thing word for word i typed it out