Which of the Following Was a Major Problem Associated with the Idea

Which of the following was a major problem associated with the idea of popular sovereignty?

A) Proponents of the idea refused to say whether or not slaves would be counted in determining the population of a territory.
B) Northern Democrats explained the idea to their constituents in one way, while southern Democrats explained it to their constituents in a different way.
C) The idea of popular sovereignty allowed Congress to determine qualifications for voting in a particular territory.
D) Those who supported the idea disagreed among themselves over whether or not free blacks would have equality under the law in the territories.