The Missouri Compromise is the act of Congress set the line of latitude at 36 degrees 30 minutes north, as the northernmost limit for slavery. Hence, option B is correct.
Slavery was outlawed in the remaining Louisiana Purchase areas north of the 36o 30' parallel after the U.S. Congress approved a statute in 1820 that accepted Maine as a free state and made Missouri a slave state while maintaining slavery in Missouri as a slave state.
The controversy around slavery gave rise to the Missouri Compromise. A bill that made Missouri a slave state in the Union had been passed.
Before the Kansa-Nebraska Act of 1854 overturned it, this agreement had been in existence for more than 30 years. In 1857, the compromise was declared to be unconstitutional.
Thus, option B is correct.
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