Which of These Explains the Generally Positive Reaction to Lincoln's

Which of these explains the generally positive reaction to Lincoln's March message concerning emancipation in March 1862?

A) Lincoln's plan for emancipation was moderate.
B) Lincoln's reelection had given him a strong mandate.
C) The progress of the war caused Northerners to rally to the president.
D) Support for abolition had grown during the first years of the war.