Read the quotation below.
a house divided against itself cannot stand. –abraham lincoln this quotation
reflects lincoln’s belief that
a) state legislators, not popular vote, should settle the slavery issue.
b) slavery should be abolished throughout the united states.
c) the united states would have to become either all slave or all free.
d) popular vote, not state legislators, should settle the slavery issue.

C) the United States would have to become either all slave or all free.

Explanation:

Abraham Lincoln said this quote on June 6th, 1858. During that time the US was facing the problem with slavery and the US Supreme Court Dred Scott's decision was fresh at that moment.

Lincoln used this phrase from the Bible to explain that the government could not sustain half slave and half free US. So slavery should either be accepted by all states or denied by all.

the correct answer is:   the domino theory states that if one country in a region came under the influence of communism, then the surrounding countries would follow in a domino effect.