Mrs. Allen is comparing the grades of her math students in two classes. Each dot represents a student. Which statement correctly compares the data? A. Class A generally has better grades than class B. B. Class A generally has the exact same grades as class B. C. Class B generally has better grades than class A. D. Although the mean of the grades of class A is greater than the mean of the grades of class B, the variability creates too much overlap for any conclusion to be made.