How does this sentence from paragraph 5 contribute to the central ideas of the text: “The debate was especially ironic because defenders of slavery relied on a central principle of fairness.”

A
It hints at the contradiction between what is fair for the states and what is fair for African Americans.
B
It undermines the notion that the Missouri Compromise was unfair.
C
It reveals how difficult the debate over Missouri statehood was due to the subjective nature of fairness.
D
It reinforces the logical reasoning of defenders of slavery.