单选题 The poor mother lacked her husband's capacity for discipline, and found herself ______her headstrong son.

【正确答案】 C
【答案解析】[解析] 四个选项的意思分别是:against the will of违背意愿。in the way of妨碍。at the mercy of受……支配。in terms of以……的观点,以……的方式。根据句意,应该选择C。