Which of the following is the best example of a correlational research study?单项选择题

A

Researchers assigned participants to do either a stressful task or an easy task and then measured the participants’ blood pressure.

B

Researchers compared the blood pressure of participants who were trained to reduce stress by meditating and participants who were trained to reduce stress by drawing.

C

Researchers measured the stress levels in participants who were given a blood pressure drug and participants who were given a placebo drug.

D

Researchers measured the association between participants’ blood pressures and their degrees of chronic stress.

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