The grades on Mr. Mueller's math exam were displayed in a histogram.

Based on this histogram, which of the following could be a list of the exam grades?

I. 55, 55, 60, 60, 65, 65, 70, 70, 70, 70, 75, 75, 80, 85, 85, 85, 85, 85, 90, 90, 95

II. 50, 55, 60, 60, 60, 65, 70, 70, 70, 75, 75, 75, 80, 80, 80, 80, 80, 85, 90, 95, 95

III. 50, 55, 65, 65, 65, 65, 70, 70, 70, 70, 75, 75, 75, 80, 80, 85, 85, 85, 85, 95, 95