In a mathematics contest with ten problems, a student gains $$5$$ points for a correct answer and loses $$2$$ points for an incorrect answer. If Olivia answered every problem and her score was $$29$$, how many correct answers did she have? 
选项为:A:$$5$$  B:$$6$$  C:$$7$$  D:$$8$$  E:$$9$$  请回答其中一个选项.