Question

I am afraid (a) / I did a mistake (b) / in the calculation (c) / No error (d) 

In these questions some of the sentences have errors and some have none. Find out which part of a sentence has an error and indicate it corresponding to the appropriate letters. If there is no error, indicate corresponding to the last option.
A I am afraid
B I did a mistake
C in the calculation
D No error
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