Why did Lincoln have to handle the slavery issue cautiously?

Question

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A. He didn't want to lose the support of the four slave states that stayed with the Union.
B. He didn't really care about the issue of slavery.
C. The North relied heavily on slavery for their economy.
D. His Republican party made a lot of money from the slave trade

Answer 1

A. He didn't want to lose the support of the four slave states that stayed with the Union.