The answer is C, they run independent campaigns in support of candidates.
A vague pronoun reference cause confusion for the reader or listener by “it makes the reader or listener take longer to understand the authors meaning”
A pronoun is a word that can be used instead of a noun. A vague pronoun reference occurs when pronouns such as they, them, theirs, are being used without their antecedents.
When the pronouns are used without their antecedents, then this will being about a situation whereby the meaning of the sentence will then be unclear. A vague pronoun is when its not clear to who or what your pronoun is referring to. The reasons include a pronoun replaces an antecedent, the antecedent of a pronoun is not clear and the pronouns do not agree in number.
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"It means Emperor of Rome who stopped the persecution of Christians and in 324 made Christianity the official religion of the Roman Empire; in 330 he moved his capital from Rome to Byzantium and renamed it Constantinople"
(A) Increases the likelihood of aggressive behavior.
source https://mobile.nytimes.com/2013/02/12/science/studying-the-effects-of-playing-violent-video-games.html?pagewanted=all&
"A dose of violent gaming makes people act a little more rudely than they would otherwise"
