Lily\textquotesingle s age plus Judy\textquotesingle s age was equal to $$17$$ two years ago. What is the sum of their ages this year? (adapted from 2016 Math Kangaroo Problem, Level 1-2, Question \#16) 
选项为:A:$$16$$  B:$$17$$  C:$$18$$  D:$$19$$  E:$$21$$  请回答其中一个选项.