Today is Amy\textquotesingle s birthday! She takes photos with her four close friends. All of them stand in a line and they make Amy stand in the middle. There are~\uline{~~~~~~~~~~}~different ways for them to form the line. 
选项为:A:$$12$$  B:$$16$$  C:$$20$$  D:$$24$$  E:$$36$$  请回答其中一个选项.