Which best explains how the kansas-nebraska act affected the missouri compromise?
a. it strengthened the missouri compromise by prohibiting slavery in states above the 36°30’ n line.
b. it overturned the missouri compromise by requiring slavery in states below the 36°30’ n line.
c. it overturned the missouri compromise by allowing the possibility of slavery in states above the 36°30’ n line.
d. it weakened the missouri compromise by allowing the possibility of slavery in states below the 36°30’ n line