Direction: In the following question, a sentence is given divided into four parts (A), (B), (C) and (D). The error, if any, will only be in one part of the sentence. Choose the option with the part containing the error and mark it as your answer. If the sentence is free from errors, mark 'No error' as your answer.

We are trying to (A)/ find the cause of (B)/ the error in our project (C)/ for the last five days. (D)