medium · GMAT Verbal

Which of the following, if true, provides the strongest alternative explanation for this finding?

1. People with higher baseline cognitive ability are more likely to enjoy and seek out mentally challenging activities such as brain-training games.
2. The brain-training games used in the study were carefully designed by a team of neuroscientists to target the skills of memory and focus.
3. Cognitive decline is widely understood to be a natural part of the aging process that eventually affects almost every person to at least some measurable degree.
4. The study was funded by a large commercial company that designs, markets, and actively sells the very brain-training software it set out to evaluate.
5. Brain-training games have now become far more popular among older adults than nearly every other available form of leisure activity in recent years.

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