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    Question

    In the following sentences, a part of the sentence is

    given in bold. Choose the best alternative that improves the sentence grammatically and contextually. If no improvement is required, choose option (D). Recent studies in behavioural economics suggest that human decision-making is often influenced by cognitive biases, which not only distorts rational judgment but also leads to systematic errors in evaluating risks.
    A which not only distort rational judgment but also lead Correct Answer Incorrect Answer
    B which not only distorts rational judgment but also leading Correct Answer Incorrect Answer
    C which not only distort rational judgment but also leads Correct Answer Incorrect Answer
    D No improvement required Correct Answer Incorrect Answer

    Solution

    This question tests subject–verb agreement + parallelism. Subject → which refers to cognitive biases (plural) So verbs must be plural Original: distorts (singular verb mismatch) leads  (again singular mismatch) Correct structure: distort … lead (plural verbs) Option analysis: A → correct plural verbs + proper parallelism  B → “leading” breaks structure  C → mixed agreement  D → incorrect  Hence, A is correct.

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