Three Statistics Classes (50 Students Each)took the Same Test

Multiple Choice

Three statistics classes (50 students each) took the same test.Shown below are histograms of the scores for the classes.Use the histograms to answer the question.
-Which class had the smallest standard deviation?

A) Class 3,because the shape is symmetric and unimodal.
B) Class 3,because the shape has the highest number of students.
C) Class 1,because the shape is fairly symmetric and uniform.
D) Class 2,because the shape is skewed.
E) None,because the classes had the same standard deviation.