Stephen had $50$ balls, and Kevin had a certain number of balls. Then Kevin sold half of his balls. Finally the number of Kevin\textquotesingle s balls is $8$ less than that of Stephen\textquotesingle s balls. How many balls did Kevin have at first? 
选项为:A:$$50$$  B:$$42$$  C:$$84$$  D:$$92$$  E:$$100$$  请回答其中一个选项.