设$$P=-\frac{1}{12345\times 12346}$$，$$Q=-\frac{1}{12344\times 12346}$$，$$R=-\frac{1}{12344\times 12345}$$，则$$P$$，$$Q$$，$$R$$的大小关系是（~ ）．
选项为:A:$$P\textgreater Q\textgreater R$$  B:$$Q\textgreater P\textgreater R$$  C:$$P\textgreater R\textgreater Q$$  D:$$R\textgreater Q\textgreater P$$  请回答其中一个选项.