The correct answer is C. Small.
The standard deviation is a measure of how spread out a set of numbers is. A small standard deviation indicates that the numbers are clustered closely together, while a large standard deviation indicates that the numbers are spread out over a large range.
If the dispersion is small, then the numbers are clustered closely together. This means that the standard deviation will also be small.
Option A is incorrect because a large standard deviation indicates that the numbers are spread out over a large range.
Option B is incorrect because a standard deviation of zero indicates that all of the numbers are the same.
Option D is incorrect because a standard deviation cannot be negative.