can you please help me with this 79

What was so significant about Lincoln’s speech: “A house divided against itself cannot stand. I believe this government cannot endure permanently half slave and half free. I do not expect the Union to be dissolved — I do not expect the house to fall — but I do expect it will cease to be divided.”?

A. That the government was divided over tax increases in the Southern and Northern states and it would cause turmoil.

B. The underlying meaning was that the nation was vulnerable to foreign invasion if they remained divided over slavery.

C. He was declaring war on the southern states.

D. That the nation could not stand if it remained divided over the issue of slavery.