Direction: Spot the grammatical errors in the given sentence. Mark the part with error as your answer. If there is no error, mark "No error" as the answer. (Ignore punctuation error)

We have received many (a)/ of the letters from customers (b)/ asking us to extend (c)/ the deadline to repay their loans. (d)/ No error(e)

[INDIAN OVERSEAS BANK (PO), 2009]