There are $20$ children lining up outside a theme park. John is the $14$\textsuperscript{th}~ person counting from the front of the line and Mary is the $2$\textsuperscript{th}~person counting from the back of the line. How many children are standing in line between John and Mary? 
选项为:A:$$1$$  B:$$2$$  C:$$3$$  D:$$4$$  E:$$5$$  请回答其中一个选项.