From an Ethical Viewpoint, the ABAB Design Is Preferred Over

Multiple Choice

From an ethical viewpoint, the ABAB design is preferred over the ABA design because:

A) the ABAB design more powerfully rules out chance fluctuations and coincidental events.
B) the ABAB design is less expensive and less time-consuming.
C) a single reversal, in most cases, tends to be an extremely powerful evidence for the effectiveness of the treatment.
D) it does not seem right to end the design with the withdrawal of a treatment that may be beneficial to the participant.