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.

Without any further information or data, we cannot determine which class had the largest standard deviation based on the shape of the distribution or the number of students. Therefore, the best answer is B, which suggests that either Class 1 or 2 could have the largest standard deviation, but we are unable to determine which one without more information.