How Did Senator Stephen Douglas Salvage the Compromise of 1850

How did Senator Stephen Douglas salvage the Compromise of 1850?

A) He won a public endorsement of the compromise from President Zachary Taylor.
B) He ultimately allowed Southern Democrats to dictate the terms of the compromise.
C) He introduced each measure of the compromise separately and in that way gained passage of all of the measures.
D) He threatened to remove Democrats who opposed the compromise from important congressional committees.