$$a=-123.4-(-123.5)$$，$$b=123.4-123.5$$，$$c=123.4-(-123.5)$$，则（~ ）．
选项为:A:$$c\textgreater b\textgreater a$$  B:$$c\textgreater a\textgreater b$$  C:$$a\textgreater b\textgreater c$$  D:$$b\textgreater c\textgreater a$$  请回答其中一个选项.