which is the best summary of the Missouri Compromise?

a to resolve the conflict between large and small states, congress was given two houses
b to resolve the issue of the extension of slavery into the Louisiana territory, a line was drawn dividing future free slave states
c to resolve the dispute between free and slave states, each slave was counted as three-fifths of a person for purpose of both taxation and representation
d to resolve the issue of the admission of California as a free state, a tougher fugitive slave law was enacted

The best summary of the Missouri Compromise is: B) To resolve the issue of the extension of slavery into the Louisiana territory, a line was drawn dividing future free and slave states.