CAT Exam Model Paper 7 with solutions for free online practice

Given below is a sentence, part or all of which, is underlined. Beneath the sentence are four ways of phrasing the underlined part. The first of these repeats the original; the other three are different.
Choose the option that produces the most effective sentence; this answer should be clear and exact, without awkwardness, ambiguity, redundancy, or grammatical error. The question tests correctness and effectiveness of expression.
Such lapses of integrity are not unique to China, but poor peer-review mechanisms, misguided incentives and a lack of checks on academic behaviour all allow fraud to be more common.