【正确答案】 B

【答案解析】[精解] 细节题。文章中提及了5个警察的别名，其中提到"an early nickname for the policeman was peeler，but this one has died out．"die out就是消失的意思，等同于题目中 "the nickname that is not used"。因此显然答案为[B]。