The correct answer is C, as Stephen Douglas proposed that Congress would vote on each Compromise of the 50's measure individually, and that helped pass the bill.
Whig party leader Henry Clay designed a form of compromise to end the crisis that plagued the Union, this document was presented at the beginning of 1850, but failed due to opposition from both pro-slavery southern democrats amd Whig anti-slavery northerners. On July 4, 1850, President Taylor contracted severe indigestion (probably the result of typhus or cholera) and five days later became the second president to die in office. Vice President Millard Fillmore assumed the presidency and became a promoter of the Compromise. Now, with the support of President Fillmore, Clay's project was reworked for a new presentation, Senator Stephen Douglas divided the original project into different bills and led the way in dealing with the tougher positions on both sides.