Question

which activity is most beneficial for maintaining brain health over time?
regular physical exercise
taking supplements
watching educational videos
getting extra sleep

Explanation:

Regular physical exercise is widely supported by scientific research in the field of medicine/health (a subfield of Natural Science) as it promotes blood flow to the brain, stimulates the release of neurotrophic factors, and helps in reducing the risk of cognitive decline over time. Taking supplements may have limited or inconsistent benefits, watching educational videos is more about cognitive stimulation in the short - term or specific learning rather than long - term brain health maintenance, and getting extra sleep, while important, regular physical exercise has a more comprehensive and long - term positive impact on brain health including aspects like neuroplasticity and vascular health.

Answer:

A. Regular physical exercise