$$42$$个小朋友排成一队去秋游，从排头往后数，小$$Y$$是第$$22$$个，从排尾往前数，小$$M$$是第$$22$$个，小$$Y$$和小$$M$$中间有个人．  42 students are standing in a line. Counting from the front, Y is the 22nd. Counting from the back, M is the 22nd. There are~\uline{~~~~~~~~~~}~people between Y and M. 
选项为:A:$$0$$  B:$$1$$  C:$$2$$  D:$$3$$  请回答其中一个选项.