PLEASEEEE HELPPPPP Which of the following best completes the diagram above? A. Rollback of funding for social welfare programs O B. Expansion of federal efforts to promote economic opportunities C. Strong opposition to deregulation and tax cuts O D. Reversal of liberal trends in Supreme Court rulings

In an effort to preserve the balance of power in Congress between slave and free states, the Missouri Compromise was passed in 1820 admitting Missouri as a slave state and Maine as a free state.

Explanation:At the time, there were 22 states, half of them free states and half of them slave states. The Senate passed a bill allowing Maine to enter the Union as a free state and Missouri to be admitted without restrictions on slavery.