Republicans, farmers and other debtors is the right answer.
Republican Congress during the time of Civil War enacted high tariffs to defend the industries of the nation and to collect the fund for the Union ministry. The tariffs also generated other countries to counter by placing taxes of their own on the farm products of the United States. This resulted in the loose of share in the overseas market for the farmers.
The answer is, "D", "Focused primarily on agriculture".
Well, the vote was always biased. Since they couldn't vote, they wouldn't be able to choose the best one for them. Even when the got to vote it was biased, because the KKK would bully them into voting for who they wanted them to vote for.