Answer is A, location.
There was a huge difference between free, and enslaved states. In this case after the year 1820, it would be dependent on where the state was located if slavery was allowed.
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With the Missouri compromise, slavery has been limited to the state based on their location. Thus, option A is correct.
Before 1800, there has been the presence of slavery all over. Although with the antislavery moments there has been the abolishment of slavery in the northern area. The southern area has been based on agriculture, and thus required slaves.
With the Missouri compromise after 1820, slavery has been allowed based on the location. Thus, option A is correct.
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