Read each sentence to find out whether there is any error in it. The error, if any, will be in one part of the sentence. The letter of that part is the answer, if there in no error, the answer is ( e ). (Ignore errors of punctuation, if any).
I remember my childhood days (a)/ when I was used to go (b)/ the farm with my father (c)/ and help him in his work (d) No error (e).

Answer

b

Explanation

Remve 'was' as 'used to' is not used in the sense of 'accustomed to' here. If is used for past habitual action.