Jenny is $5$ years old. She has $2$ sisters, Julie and Jas. Julie is $1$ year older than Jas. In two year\textquotesingle s time, their total age will be $18$ years. How old is Julie now? 
选项为:A:$$3$$  B:$$4$$  C:$$5$$  D:$$6$$  E:$$7$$  请回答其中一个选项.