The policy that allows people to vote on whether they would be for or against slavery is Popular Sovereignity.
What is popular sovereignty?
This is a policy that calls for decisions to be made by the citizens of a country through voting.
This was used in territories like Kansas, where the people were allowed to vote on becoming free or slave states.
In conclusion, option A is correct.
Find out more on popular sovereignty at https://brainly.com/question/1091566.
