Dividing a certain two-digit number by $$10$$ leaves a remainder of $$9$$, and dividing it by $$9$$ leaves a remainder of $$8$$. The sum of the number\textquotesingle s two digits is． 
选项为:A:$$7$$  B:$$9$$  C:$$13$$  D:$$17$$  请回答其中一个选项.