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MediumStandard English Conventions

After winning the 1860 presidential election, Abraham Lincoln appointed Edward Bates, Salmon P. Chase, and William H. Seward to his cabinet. Lincoln’s decision was surprising, since each of these men had run against him, but historians have praised it, noting that Lincoln his rivals’ diverse talents to strengthen his administration.

Which choice completes the text so that it conforms to the conventions of Standard English?