Consider an Experiment in Which Rats Are Given Three Diets

Consider an experiment in which rats are given three diets (reduced calorie, control, and increased calorie) and their masses at 6 weeks of age are measured. Which of the following is an aspect of poor design in the figure shown?
​
​

A) The different patterns for the groups provide no additional information because they are redundant with the labels.
B) The figure is black and white; color is always better when making figures and graphs.
C) The unit for mass in the axis label should be spelled out with words instead of abbreviated within the parentheses.
D) Since the minimum group mean is 20, dropping the axis all the way down to zero is too far and wastes space.