The Compromise of 1877 was ultimately used to settle the disputes over the presidential election of 1876.
It was the proposed informal and unwritten deal that settled the the intensely disputed 1876 U.S. presidential election.
The Compromise of 1877 resulted in the United States federal government pulling the last troops out of the South, and formally ended the Reconstruction Era.
Hence, the Compromise of 1877 was ultimately used to settle the disputes over the presidential election of 1876.
Therefore, the Option D is correct.
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