Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Muscles are bundles of fibers that can contract. Given the two facts above, what contracts as it gets shorter?

Available options:
(A). layers of fat
(B). Epidermis
(C). Veins and arteries.
(D). Shortstop
(E). Labor
(F). Contracts
(G). the body's largest organ
(H). Bundles of fibers
The answer is:
(H).