A stop-smoking program requires participants to monitor their smoking and to control the number of cigarettes they smoke. The program sets a target for the number of cigarettes a participant is allowed each day, and the target number is changed every three days. Although the target moves up and down, it gradually reduces toward a goal of zero smoking after six weeks. If this program were evaluated using a single-subject design, which design would be appropriate?
a. ABAB design
b. multiple-baseline design
c. alternating-treatments design
d. changing-criterion design
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