According to the context, it can be inferred that the term that best completes the title is Closed Primaries (option A).
A primary election is a term that refers to a type of election in which voters in a jurisdiction select the candidate that a party will field in a subsequent public election.
This can be open or closed, in the case of being open, any voter can vote for the candidates, while when it is closed, voters must register in advance to be able to participate in the election of a particular party.
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