hard · GMAT Verbal
Argument: A study found that individuals who consume at least two servings of blueberries per week perform better on cognitive memory tests than those who do not. Researchers concluded that the antioxidants in blueberries are responsible for enhancing neural pathways involved in memory.
Which of the following is an assumption required by the researchers' conclusion?
- The subjects in the study did not take any other supplements known to improve cognitive function.
- Antioxidants are the only compounds in blueberries that could possibly affect brain health.
- Blueberries contain a higher concentration of antioxidants than any other fruit or vegetable.
- People with naturally better memories do not simply happen to have dietary habits that include more fruit, such as blueberries.
- The participants who ate blueberries did not also follow other healthy dietary or lifestyle habits that independently improve memory.
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