According to the Text, a Disadvantage of a Within-Subjects Design

Multiple Choice

According to the text, a disadvantage of a within-subjects design is that:

A) it is less powerful than a between-subjects design.
B) more subjects are required than in a between-subjects design.
C) each subject must spend more time in your experiment and thus may become fatigued.
D) matching of subjects becomes cumbersome even in simple within-subjects designs.