During a One-Hour Session,a Therapist Switches Back and Forth Between

Multiple Choice

During a one-hour session,a therapist switches back and forth between periods of personal comments aimed directly at the patient (You seem to be quite happy today.) and periods of impersonal comments (Happiness often is associated with sunny weather.) .The therapist records how many self-revealing statements the patient makes during each period to see if there are any consistent differences.The researcher is using a(n)

A) ABAB design.
B) multiple-baseline design.
C) alternating-treatments design.
D) changing-criterion design.