In the given sentences some have errors and some are correct. Find out which part of a sentence has an error and corresponding to the appropriate letter (a), (b), (c). If a sentence is free from errors corresponding to (d):Question :Do you know that it was I (a)/ who has done(b)/ this piece of bearutiful work?(c)/ No error (d)

• A. a
• B. b
• C. c
• D. d