The correct answer is C. Standard Deviation.
The standard deviation is a measure of how spread out numbers are in a data set. A low standard deviation indicates that the data points tend to be very close to the mean, while a high standard deviation indicates that the data points are spread out over a large range of values.
The median is the middle value in a data set, when the data is arranged in order from least to greatest. The mean is the average of the values in a data set. The mode is the most frequently occurring value in a data set.
Here is an example to illustrate the difference between these measures. Consider the following data set:
2, 4, 6, 8, 10
The median is 6, the mean is 7, and the mode is 6. The standard deviation is 2.5.
As you can see, the standard deviation is a measure of how spread out the data points are, while the median, mean, and mode are measures of central tendency.