【正确答案】 D

【答案解析】解析：chaos n.混乱，紊乱(如：The country was in chaos．The house was in a state of chaos when the burglars had left．)。commotion n．混乱，动乱，骚动。contradiction n．矛盾，不一致。riot n．聚众闹事，骚乱。