Which of These Statements Describes the "Least Squares" Principle

Multiple Choice

Which of these statements describes the "least squares" principle?

A) The mean is the point in a distribution around which the variation of the scores is minimized.
B) The range of an interval-ratio-level variable can never exceed the value of its mean.
C) The interquartile range will always contain a variable's median, but not necessarily the variable's mean.
D) Taking the square root of a variable's mean will create a more symmetrical distribution.