In Bill\textquotesingle s class, every student can play either piano, or violin, or both. $24$ of his classmates can play piano, and the number of students that can play violin is half of that of playing piano. If there are $4$ students who can play both, how many students are there in the class? 
选项为:A:$$68$$  B:$$20$$  C:$$38$$  D:$$34$$  E:$$32$$  请回答其中一个选项.