In a class of $50$, every student had to take an extra module. Some students took extra mathematics modules while some students took extra science modules. A total of $38$ students took the extra mathematics modules while $24$ students took extra mathematics and science modules. How many students took extra science modules? 
选项为:A:$$12$$  B:$$24$$  C:$$26$$  D:$$36$$  E:$$39$$  请回答其中一个选项.