Part of the sentence has an error. Mark the part which has an error. If there is no error mark no error as your answer.

It had been a trying season so far for the Salesman, (A) who has never regained the form (B) that got him the title of 'Bazinga' in his days of glory. (C) Those were happier times and the age of machines was unheard of by the general masses.(D)