What did the control group in Jia Hu's study reflect on?

• A. Their daily routine.
• B. A significant error in procedure.
• C. The weather conditions.
• D. The sample size.

Answer: (A)

The question tests understanding of what a control group does and what they report. The control group is kept under baseline conditions—without the experimental manipulation—so their data reflect ordinary, everyday experiences. When asked what they reflected on, the most natural and meaningful answer is their daily routine, because that baseline baseline behavior provides a comparison point for the experimental group.

Weather conditions aren’t tied to the participants’ typical activities and would be an external factor not central to the study’s baseline measurement. The sample size is a design detail, not something the participants reflect on during data collection. A significant error in procedure is something researchers identify or note about the process, not something the participants would report about their own routine.