This view has been taken a by one of the ablest persons b who has written on this subject c No error...........

English Aptitude (NDA) Error correction

Directions: Each item in this section has a sentence with three underlined parts labeled (a),(b) and (c). “Read each sentence to find out whether there is any error in any underlined part and indicate your response in the answer sheet against the corresounding letter , i.e. (a),(b) or (c). If you find no error, your response should be indicate as (d).

This view has been taken(a)/ by one of the ablest persons(b)/ who has written on this subject(c)/No error(d)

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Explanation:

"by one of the ablest persons" has error. We do not use superlative degree with ‘one of the’ as there can be only one person who is superior to all not many superiors or all superiors.
Hence option2 is correct