The correct answer is C. "Samuel Tilden and Rutherford B. Hayes agreed to serve on the same ticket in exchange for Northern concessions in the South."
The Compromise of 1877 was a deal created in order to resolve the dispute for 1876 U.S presidential election between the Democratic candidate Samuel Tilden and Republican candidate Rutherford B. Hayes.
Democrats agreed in order for Rutherford B. Hayes become a president the withdrawal of federal troops from Louisiana and South Carolina and the concession of home rule in the South.
The withdrawal of federal troops from the South marked a big decisive change in the history of American political that ended the Reconstruction Era.