If you were running a marathon, which type of muscle fibers would be most useful to you? A.
slow-twitch
B.
fast-twitch, type I A
C.
intermediate-twitch, type II B
D.
slow-intermediate twitch, type I B

Slow-twitch muscle fibers

Explanation:

Fast Twitch Muscle Fiber Types. The two types of skeletal muscle fibers are slow-twitch (type I) and fast-twitch (type II). Slow-twitch muscle fibers support long distance endurance activities like marathon running, while fast-twitch muscle fibers support quick, powerful movements such as sprinting or weightlifting.

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explanation: