Psychologists has done a 1 considerable amount of research 2 to assess the effectiveness of various ...........

English Language (IBPS PO) Error correction

Direction: Read the sentence to find out whether there is an error in it. The error, if any, will be in one part of the sentence. The number corresponding to that part will be your answer. If the given sentence is correct as it is, mark the answer as ‘No error’. Ignore the errors of punctuation, if any.

Psychologists has done a (1)/ considerable amount of research (2)/ to assess the effectiveness of various strategies (3)/ for behaviour modification. (4)

No error

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Explanation:

The error is in the first part of the sentence.
We need to replace 'has' with 'have'. Plural subject 'Psychologists' should be accompanied by plural auxiliary verb 'have' in accordance with the rule of subject-verb agreement.
So, the correct answer is option A.