In a class of pupils, $80\textbackslash\%$ participated in basketball, $85\textbackslash\%$ participated in football, $74\textbackslash\%$ participated in softball and $68\textbackslash\%$ participated in squash. Find the minimum percentage of pupils who participated in all the four sports events. 
选项为:A:$7\textbackslash\%$  B:$10\textbackslash\%$  C:$12\textbackslash\%$  D:$15\textbackslash\%$  E:None of the above  请回答其中一个选项.