What was not part of the union's three-part plan to conquer the south?
a. blockading southern ports
b. drafting freed slaves to fight for the union
c. capturing the confederate capital
d splitting the confederacy in two

i feel like its either b or d but i'm not sure

Your answer is B.) drafting freed slaves to fight for the union.
the union wanted to cut off the confederacy from any supplies making them starve. they wanted to conquer the south's capital, and they wanted to split to confederacy in half so reinforcesments could not come.