参考答案

正确答案：D
解析：题目问：作者认为，唯一能够结束战争的方法是什么?第一段倒数第二句“To do this，we need to persuade mankind to look upon international questions in a new way，not as contests of force，in which the victory goes to the side which is most skillful in massacre，but by arbitratiOn in accordance with agreed principles of law．”通过这句话可知，结束战争的唯一方式就是通过谈判来解决国际争端问题，而不是诉诸武力。所以，答案是D。