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.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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