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Research indicates that for members of congress to be reelected to office for a second term what is required is that the success of an earlier election campaign be repeated and that their voter base remain informed about their legislative achievements.
This sentence makes correct use of parallelism by placing two clauses in parallel construction that the success...be repeated and that their voter base remain informed, etc. It also uses the subjunctive correctly by using the V1 forms of the verbs (be and remain) following required...that.
Although this answer choice is stylistically imperfect because of the use of the Passive construction (be repeated), it is the only answer choice that is grammatically correct and logical.
What helps us identify this question as a Parallelism question is the following Stop Sign:
A and/or/but B
This answer choice is grammatically incorrect. The construction A and B (to repeat the success and that the voter base remain) requires that A and B belong to the same part of speech. In this case, A (to repeat the success) is a verbal phrase (starting with the infinitive to + verb), whereas B (that their voter base remain) is a clause.[[snippet]]
This answer choice is illogical. By changing the pronoun their to its, the corrected sentence creates a Pronoun Agreement mistake. In the original sentence their refers to the plural (human) noun members of congress.
Besides being illogical in the context of the sentence's meaning, the pronoun its in the corrected sentence, is also ambiguous. Technically it could refer to any of the preceding singular nouns (e.g. voter base, election campaign, success) none of which are logical in this context.
What helps us identify Pronoun mistakes is the following Stop Sign:
Every pronoun in the underlined part of the sentence or after it
This answer choice is grammatically incorrect. Require is one of the nine verbs to which the Subjunctive rule applies (if it is followed by that). This means that the next verb after (what is) required is that should be in base form. However, remains is not in base form.
What helps us identify this question as a Subjunctive question as well as identify the mistake is the following Stop Sign:
Whenever you come across this Stop Sign, make sure that the following verb is in its base form.
This answer choice is grammatically incorrect. The singular verb is does not agree with the plural subject a successful repetition...and the remainder.
In addition, the corrected sentence is stylistically flawed and changes the meaning of the original sentence. The phrase a successful repetition of an earlier election campaign is wordy and awkward.
Moreover, the phrase remainder of the voter base, which means what is left of the voter base, changes the meaning of the original sentence, and is inappropriate here. Informed remainder is not the same as to remain informed which means to stay informed or continue to be informed.