Correct option is A. The same analysts who once favored public-opinion
polls now see them as hampering representative government.
The given sentence is correct as is: it has a sound construction with no grammatical errors. Thus A is the answer.
Grammatical error is a term used in prescriptive grammar to describe an instance of faulty, unconventional, or controversial usage, such as a βmisplaced modifier or an inappropriate verb tense. Also called a usage error.
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