How Was the Union Able to Begin Leading Reconstruction Efforts

How was the Union able to begin leading Reconstruction efforts in the South?

A) Lincoln strategically waited to begin the process of Reconstruction in conquered areas until after the Civil War was officially over.
B) Lincoln issued a Proclamation of Amnesty and Reconstruction, allowing for Rebel states to be pardoned after 10 percent of those who had voted in 1860 took an oath of allegiance.
C) Lincoln pardoned all Confederate government officials as well as all soldiers and senior officers in the Confederate army and navy.
D) Against Lincoln's wishes, the Wade-Davis Bill went into effect, requiring a majority of white male citizens who had voted in 1860 in Rebel states to pledge allegiance to the Union.
E) The Union government agreed to allow slavery for the next 50 years but only in certain parts of the South where it was most crucial to the economy.