Answer:
a. Sometimes candidates unpopular with the party leadership reach the top.
Step-by-step explanation:
Under the primary system there is voting on the ballots which is secret in nature and under the caucus system people vote after listening to the individual nominees and then accordingly to the candidate they like.
In this manner, the candidates who are not even belonging to some recognized or popular parties are in leadership as their individual speech is too alluring to the people present for voting that they vote for that specific candidate.
Thus, the correct answer is:
Statement a.