Answer: B. standard deviation
Step-by-step explanation:
In statistics , Standard deviation is a term which is used to to represent the measure of dispersion of data from the mean-value.
It is used to determine how closely the data values are with the mean of the entire data.
It is the average distance from each data value to the mean.
Hence, the average distance between the variable scores and the mean in a set of data is the standard deviation.