One of the Problems of Using a Withdrawal Design as Part

Multiple Choice

One of the problems of using a withdrawal design as part of a single-case experiment is the

A) difficulty of measuring changes that are associated with removal of a treatment.
B) confounding factor of the placebo effect when the treatment is removed.
C) ethical issue of removing treatment that appears to be helping the patient.
D) impossibility of removing the treatment equally for the treatment subjects and control subjects.