What did lincoln make people see about slavery?

that is would be to make a new compromise and stay unified as one
nation.

that it was a moral issue, and anger and hate would not solve the problem.

that it would be best to divide the southern and northern states into two
countries.

The correct answer is A) That is would be helpful to make a new compromise and stay unified as one nation.

What Lincoln made people see about slavery was that "That is would be helpful to make a new compromise and stay unified as one nation."

That is why Abraham Lincoln said the biblical phrase "a house divided line" during one of his speeches during the Lincoln-Douglass debates when both were trying to be elected Senators for the state of Illinois in 1858. The complete phrase is "A house divided against itself cannot stand."