Janice was involved in a single-case experiment where the treatment was introduced, withdrawn, and then reintroduced.Janice most likely participated in a study that used a ________ design.

A) longitudinal
B) cross-sectional
C) reversal
D) multiple-baseline

A reversal design, also known as an A-B-A design, involves introducing a treatment (A), withdrawing the treatment to observe if changes reverse back to baseline (B), and then reintroducing the treatment (A). This design allows researchers to assess the effect of the treatment by comparing the baseline phase to the treatment phase and observing whether the behavior changes back to baseline when the treatment is withdrawn.