Each of the following sentences has been divided into five parts (a), (b), (c), (d) and (e). One of these parts may contain a grammatical or contextual error. Identify the part that contains the error. If there is no error, choose option (e). If the generals had planned the campaign more cautiously (a),/they would face far fewer setbacks today (b),/ especially in regions where supply lines are fragile (c),/ and morale remains uncertain among troops (d)./ No error (e)