There are two clues to solve this question. The first is the mandatory pair (A-B). Statement B has to come immediately after statement A as B is the response of the Labour party to the ‘row about the legitimacy....’’ mentioned in A. This leaves us with options (b) and (d). Here the difference is in the order of statements D & E. (D-E) would be the correct order as statement D introduces the event while statement E begins the description of the events that followed. Statement E also matches the tone of statement C.