Who can vote in a republican closed primary election?
a. a democrat
c. an independent
b. a republican
d. anyone qualified to vote

In a republican closed primary election, a Republican has the right to vote. The correct option among all the options given in the question is option "b". A closed primary election is done while selecting a candidate for the main election within a party. Primaries are very common among the parties in United States of America.

C; skin, is the answer!