Just months after entering politics, he finds he has been under ________ by a dogged justice system.
句意：进入政界几个月后，他就发现自己已经处于司法系统的监督下了。scrutiny详细审查；监视。sanity明智；头脑清楚。scarcity不足；缺乏。serenity平静，宁静。因此，本题的正确答案为C。