i'm stuck on this one..between B and C

Question

During the early part of the war, Lincoln's main goal was to
a. reduce the power of the states
b. preserve the Union
c. stop the spread of slavery
d. free the slaves

???

Answer 1

What did the war have to do with stopping the spread of slavery?

Answer 2

wasn't Lincoln against slavery and all...?

Answer 3

Yes. But that wasn't his prime motivation in fighting the Civil War. Check out this article.

http://en.wikipedia.org/wiki/Abraham_Lincoln_on_slavery

Answer 4

so b

Answer 5

Yes.