Final answer:
The ABAB design is a type of reversal design used in scientific research to evaluate the effects of an intervention or treatment by alternating between baseline and intervention phases. The correct answer is C. ABAB design.
Step-by-step explanation:
ABAB design is a reversal design used in scientific research to evaluate the effects of an intervention or treatment. In this design, the researcher alternates between a baseline phase (A) and an intervention phase (B). By examining the changes in the dependent variable during each phase, the researcher can determine the effectiveness of the intervention.
For example, let's say a researcher wants to investigate the impact of a new teaching method on student performance. They would start with a baseline phase (teaching method A), then introduce the intervention phase (teaching method B), and then return to the baseline phase (teaching method A again). By comparing the performance of students during each phase, the researcher can assess whether the new teaching method had a positive effect.