Answer:
A (Its all about Process)
The <em>Slave Trade-Export Compromise</em> <em>stated that slave trade could continue without interference from Congress for</em> 20 years, not 30. This Compromise effectively protected slave owners and the slave trade during 20 years ̶ until 1808. Congress could not prohibit slaves trade but they could place taxes on them as they were technically considered as merchandise.
Opportunity cost refers to what you have to give up to buy what you want in terms of other goods or services. When economists use the word “cost,” we usually mean opportunity cost.
Abolition of slavery and promotion of equality. You won't find a result that's visible on the long term more clearly than the abolition of slavery. Ever since the end of the civil war, slavery was abolished, however, racists found other ways of attacking the African American people.