In the following question, some parts of the sentence have errors and some are correct. Find out which part of a sentence has an error. If the sentence is free from error, choose No error. The old, grey horse that was standing beside the barn had a sad look in its eyes when it saw the shotgun that the farmer was carrying.

• A. The old, grey horse that was standing
• B. No error
• C. had a sad look in its eyes when
• D. shotgun that the farmer was carrying