As expressed by Lincoln, what are two central ideas in this sentence from this paragraph?

"If we shall suppose that American slavery is one of those offenses which, in the providence of God, must needs come, but which, having continued through His appointed time, He now wills to remove, and that He gives to both North and South this terrible war as the woe due to those by whom the offense came, shall we discern therein any departure from those divine attributes which the believers in a living God always ascribe to Him?"

a) War is the natural consequence of the immoral behavior by the South, and the North is awarded excellently in its pursuit of God's will.

b) Slavery is ended solely by the will of God, and those that participate in slavery must continue to honor God's will.

c) War is a necessary evil that is determined by God's will, and the war of the North and the South is unavoidable.

d) Slavery is an inevitability continued or discontinued at God's will, and God's power must be honored even when punishment causes suffering.