Which of the following describes a county unit system?
A. Candidates running for state office were not selected by popular vote but were selected by the vote of the whole county.
B. Candidates running for state office were selected by popular vote not by the county as a whole.
C. Candidates running for state office were selected by a secret ballot.
D. Candidates running for state office were selected by popular vote but were not allowed on the ballot for the primary election.