Lincoln’s Emancipation Proclamation created uncertainty over whether the President alone could lawfully free the slaves. What remedy was applied to resolve this issue?

a. The Southern States signed a document promising to end slavery.
b. The 13th Amendment was added to the U.S. Constitution, prohibiting slavery.
c. Lincoln’s Attorney General proposed a bill that was agreed to by members of the U.S. Congress, abolishing slavery.
d. General Sherman and his army announced they were setting all the slaves in the South free.