I would say D is the answer
Answer:
Fearing that the issue might disrupt the Republic, he argued for the doctrine of popular sovereignty-the right of the people of a state or territory to decide the slavery question for themselves-as a Union-saving formula. He led the fight in Congress for the Compromise of 1850.
It consisted of laws admitting California as a free state, creating Utah and New Mexico territories with the question of slavery to be figured out in their own state by popular sovereignty, ending the slave trade in Washington DC (important) and making it easier for southerners to capture and take back run away slaves
People had an easier way to transport waste outdoors from inside facilities.
Hope this helps