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Expression of IdeasHardResult with the study's limitation

Expression of Ideas practice question

While researching a topic, a student has taken the following notes: - A study compared 1,200 commuters who cycled to work with commuters who drove. - Cyclists reported 20% lower stress levels than drivers. - Stress was self-reported on a questionnaire. - Commuters had chosen their own way of getting to work.

The student wants to present the study's result while acknowledging a limitation. Which choice most effectively uses relevant information from the notes to accomplish this goal?

  1. A. Cyclists reported 20% lower stress than drivers, though because commuters chose their own mode of travel, the study cannot show that cycling caused the difference.Correct
  2. B. The study compared 1,200 commuters.
  3. C. Cycling to work reduces stress by 20%.
  4. D. The study measured stress with a blood test, so its result is reliable.

Answer: A. Cyclists reported 20% lower stress than drivers, though because commuters chose their own mode of travel, the study cannot show that cycling caused the difference.

Result plus the self-selection limitation — choice A.

Why the other answers are wrong

B. The study compared 1,200 commuters.
Setup only.
C. Cycling to work reduces stress by 20%.
The result stated as a cause, with no limitation.
D. The study measured stress with a blood test, so its result is reliable.
The notes say stress was self-reported on a questionnaire.

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