Mrs. Smith is comparing the test grades between her morning and afternoon class.

Which statement BEST compares the two graphs?
A) Since the range of scores for her afternoon class was smaller by 2 points than the range for the morning class her afternoon class did better.
B) Since her afternoon class had more variability whereas her morning class was clustered around 80 this shows that her afternoon class did better.
C) Overall her morning class did better even though there were several gaps in the lower scores and larger variability in the upper scores than her afternoon class.
D) Overall her morning class did better. It was tightly clustered around 80 with some variability in grades between 40 and 70 whereas her afternoon class had much more variability in the lower grades between 40 and 60 and few scores that were above 70.