Directions: In the sentence given below, one/some parts have errors and others are correct. Find out which part has an error and mark it as your answer. If there is no error, mark 'No error' as your answer.

Britain can either exit from the EU by letting the two parts of Ireland work/ (A) as separate countries, or stay together with a commercially unified Ireland,/ (B) it cannot do both. But this is the very impossible thing that British/ (C) voters asked for with their ‘leave’ mandate in the Brexit referendum./ (D)