The question is from CAT Sentence Correction. CAT exam has not been testing Sentence Correction for the past 5 years. It is still important to better understand English Grammar. Solve CAT Questions from Sentence Correction to get more practice and 2IIMs CAT questions bank provides you with CAT questions from Sentence Correction that can help you gear for CAT Exam.
Question 4: Long-term risk is rarely taken by air-quality indices into account, they also vary from place to place.
In the given sentence, ‘they’ in the second clause seems to refer to ‘long-term risk’, which is the subject of the first clause. So it is grammatically incorrect.
Now let us look at the answer options.
Option C does not make sense. So we rule this out.
Option B has two independent clauses- (1) Rarely do air-quality indices take long-term risk into account, and (2) they also vary from place to place. Each of these is a sentence in its own right. When joining two independent clauses without the use of a coordinating conjunction (and, but, or, or nor), a semicolon has to be used, not a comma. So option B is incorrect.
In option A, again, there are two independent clauses - (1) Air-quality indices rarely take long-term risk into account, and (2) they also vary from place to place. The clauses are joined by a semicolon. So option A is grammatically correct.
The question is " Choose the grammatically correct option "
Choice A is the correct answer.
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