Answer:
The correct answer is B. A voter who is not registered as a Republican cannot vote in a closed Republican primary.
Step-by-step explanation:
The primary elections are those in which the political parties determine their candidates in order that they participate in the general elections against the candidates of other political parties. They are, in other words, the internal elections of each political party. Therefore, being internal, only the members of each party can vote in them. That is why a voter not registered as a member of the Republican Party could not vote in the primaries of that party.