A Drawback to the Completely Within-Subjects Factorial Design Is That

Multiple Choice

A drawback to the completely within-subjects factorial design is that:

A) too many subjects are required as the design gets larger and larger.
B) carryover effects cannot be dealt with.
C) as the number of factors increases, so does the number of treatments that the subjects must go through, making the design cumbersome and complex for subjects.
D) None of the answers is correct.