One Hundred Students Are Enrolled in State University's Course on Introductory

One hundred students are enrolled in State University's course on introductory physics for math and science majors.In the group,60 students are math majors and 40 are science majors.Sarah is in the class.She got all As in her high school science courses,and she would like to be a chemist someday.She lives on campus.Her boyfriend is also in the class.There is achance that Sarah is a science major.

A) 40%
B) 50%
C) 60%
D) 100%