Which Statement Is Not True Concerning Sturges' Rule

Multiple Choice

Which statement is not true concerning Sturges' Rule?

A) It proposes adding one class (bin) to the histogram for each extra observation.
B) If you double the sample size, you should add one class.
C) Its purpose is to tell how many classes (bins) to use in a frequency distribution.
D) It is only a guideline and may be overruled by other considerations.