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A 80 percent fast-twitch muscle fibers and 20 percent slow-twitch muscle fibers
B 20 percent fast-twitch muscle fibers and 80 percent slow-twitch muscle fibers
C 50 percent fast-twitch muscle fibers and 50 percent slow-twitch muscle fibers
D 40 percent fast-twitch muscle fibers and 60 percent slow-twitch muscle fibers
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