The logic behind this behavior is that party labels are used as information shortcuts by voters, so candidates use them to convey a message about themselves.
Even candidates who run in nonpartisan elections use party labels sometimes, and the reason for that is quite simple. Voters associate a certain image, certain values and goals with different parties. Therefore, they use party labels as information shortcuts.
In other words, when voters know a candidate belongs to a party, they already know what to expect of that candidate. If they agree with that party's values, chances are that they will vote for that candidate. By using a party label, thus, the candidate is sending a message about him or herself to voters.
With the information above in mind, we can conclude that the answer provided is correct.
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