The correct answer here is C.
It may sound strange but both Abraham Lincoln and Jefferson Davis were presidents during the Civil War that raged from <span>1861 to 1865. Abraham Lincoln was the legitimate president of the United States and the leader of the Union while Jefferson Davis was the president in the Confederacy. </span>
B
President Truman declared the US's intervention as "police action" and did not declare war formally.
I'm not sure what your word choice is, but the economy during the 1920s was "good". Prior to the Depression, the economy was stable and business investments were increasing.