Which Class Had the Largest Standard Deviation

Multiple Choice

Which class had the largest standard deviation?

A) Class 3,because the shape has the highest number of students.
B) Class 1 or 2,but you can't tell for sure which one.
C) Class 3,because the shape is symmetric.
D) Class 1,because the shape is not perfectly symmetric.
E) None,because the classes had the same standard deviation.