The correct answer is A) Slavery would be abolished in Washington DC.
The Compromise of 1850 was a critical law, as it helped to prevent the Civil War from starting in the 1850's. Due to America's expansion into the west and the newly gained territory after the Mexican American War, Northern and Southern politicians were arguing constantly over whether or not slavery will exist in these new territories.
To make both sides satisfied, Henry Clay helped to develop the Compromise of 1850.This included California becoming a free state, New Mexico and Utah using popular sovereignty to determine whether or not slavery would exist, and the slave trade would be outlawed in Washington DC. However, this law said nothing about the actual institution of slavery in DC.