The assassination of abraham lincoln

a. politically benefited the south.
b. moderated the political bitterness felt in the north toward the south.
c. was a substantial political calamity for the south.

c. was a substantial political calamity for the South.

Explanation:

Lincoln was assasinated by John Wilkes Booth on 1865, right near the end of the Civil War. Booth sympathized with the confederates, who lost the war, and wanted to avenge them.

Soon after that, the South surrended, which led to political and economical problems.

So the corret answer is:

c. was a substantial political calamity for the South.

its perfect how it was