Answer: B. the spread of slavery into the West.
Explanation:
It was an established fact in the years leading up to the Civil War that the South was pro-slavery and the North was Anti-slavery and so both sides had arguments about the spread of slavery into the western territories as those territories gained statehood.
The South wanted slavery to spread into the territories so that they would have more states which would give slavery more representation in Congress and therefore keep the practice going. The North wanted the territories to be free for the same reason.
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Parliament members usually get a position by persuading a political party to put their name on the ballot, and the voters choose between two or three national parties. On the other hand, a person comes into position in congress by running in a primary election, and political parties rarely affect the choice of who is nominated.