Q: Fact 1: Muscle contraction occurs when muscle fibers get shorter. Fact 2: Fibers are oriented diagonally across fiber. Given the two facts above, muscle contraction occurs when a diagonally oriented part of muscle gets what?

Select from: (I) shorter; (II) longer; (III) vertical; (IV) decreases; (V) resistance; (VI) muscles; (VII) movement; (VIII) forces;
A:
(I)