Which description matches the control group in Jia Hu's study?

• A. The weather conditions.
• B. Daily routine.
• C. Sample size.
• D. Data collection methods.

Answer: (B)

The control group is the baseline condition kept under normal, unaltered circumstances so researchers can compare what happens when the experimental variable is introduced. In Jia Hu's study, describing the control group as continuing with their daily routine means participants are maintaining their usual activities without the experimental manipulation. This provides a true baseline to see if the intervention causes any change.

Weather conditions, sample size, and data collection methods each refer to different aspects of the study (environmental context, how many participants, and how data are gathered) rather than describing the condition of the control group itself. So the description that best matches the control group is daily routine.