easy · LSAT Logical Reasoning

Which one of the following, if true, most strengthens the argument?

1. A study of professional baseball players found that those who hit an eight-hour sleep target connected with fastballs ten percent more often.
2. Caffeine acts as a powerful stimulant that can briefly sharpen an athlete's alertness and noticeably quicken his or her reaction speed.
3. Many elite athletes struggle with chronic insomnia brought on by the relentless mental and physical pressures of professional competition.
4. Getting a full eight hours of sleep makes any athlete, in any sport, the single fastest competitor in every reflex-based event he enters.
5. Reaction time naturally and steadily slows as an athlete grows older, whatever that athlete's nightly sleep habits or training regimen may be.

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