A) The Great Compromise INCORRECT The Great Compromise, also known as the Connecticut Compromise, resolved the dispute between large and small states over representation in Congress. It established a bicameral legislature with proportional representation in the House of Representatives and equal representation in the Senate. This compromise did not address the counting of enslaved people for representation or taxation, but rather focused on the structure of the legislative branch. While it was a significant agreement at the Constitutional Convention, it is not the correct answer to the question about enslaved people.
B) The Missouri Compromise INCORRECT The Missouri Compromise was an agreement passed in 1820, well after the Constitutional Convention, to regulate slavery in the western territories. It admitted Missouri as a slave state and Maine as a free state to maintain the balance of power in the Senate, and it prohibited slavery north of the 36°30′ parallel in the Louisiana Purchase territory. This compromise was a later attempt to address the expansion of slavery, not the counting of enslaved people for representation, which had already been settled by the Three-Fifths Compromise.
C) The Commerce Compromise INCORRECT The Commerce Compromise was an agreement at the Constitutional Convention that gave Congress the power to regulate interstate and foreign commerce, but it prohibited tariffs on exports and limited the federal government's ability to interfere with the slave trade for a period of 20 years. This compromise addressed economic and trade issues, not the counting of enslaved people for representation or taxation. It was a separate agreement that balanced the interests of commercial and agricultural states.
D) The Three-Fifths Compromise CORRECT The Three-Fifths Compromise was a key agreement at the Constitutional Convention that determined how enslaved people would be counted for both representation in Congress and for federal taxation. It was a compromise between Southern and Northern states, with Southern states wanting enslaved individuals to count fully for representation but not for taxes, and Northern states wanting the opposite. The compromise, which counted three-fifths of the enslaved population, gave Southern states additional representation in the House of Representatives and the Electoral College, thereby increasing their political power. This agreement was a pragmatic solution to a deeply divisive issue, but it also entrenched slavery in the Constitution and contributed to the sectional tensions that eventually led to the Civil War.