medium · GMAT Verbal

This conclusion assumes which of the following?

1. The participants in the study were aware that they were taking the supplement during the trial period.
2. Blood pressure cannot be meaningfully reduced through any other method besides taking this particular supplement.
3. No alternative factor, such as lifestyle change during the study, was responsible for the observed decrease.
4. Every single participant who enrolled in the six-month study happened to be exactly the same age as one another.
5. The supplement guarantees an identical 10 percent reduction in blood pressure for each future user.

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