The correct answer is A. Variance.
Variance is a measure of how spread out numbers are in a data set. It is calculated by taking the square of the difference between each data point and the mean of the data set. A high variance indicates that the data points are spread out over a large range, while a low variance indicates that the data points are clustered close together.
Median is the middle value in a data set when the data is arranged in order from least to greatest. If there is an even number of data points, the median is the average of the two middle values.
Mode is the most frequent value in a data set.
Skewness is a measure of how asymmetrical a data set is. A data set with a positive skew has a long tail on the right, while a data set with a negative skew has a long tail on the left.