Last School Year, the Student Body of a Local University

Multiple Choice

Last school year, the student body of a local university consisted of 30% freshmen, 24% sophomores, 26% juniors, and 20% seniors. A sample of 400 students taken from this year's student body showed the following number of students in each classification. ​ We are interested in determining whether or not there has been a significant change in the classifications between the last school year and this school year. At a .01 level of significance, the null hypothesis

A) should not be rejected.
B) should be rejected.
C) was designed wrong.
D) cannot be tested.