Q: Fact 1: Shivering occurs when many muscles contract a little bit all at once. Fact 2: Another response to cold is shivering. Given the two facts above, a response to what occurs when many muscles contract a little at once?

Options: (I) heat; (II) cold; (III) sweat; (IV) pain; (V) forces; (VI) stress; (VII) comfort; (VIII) motion;
A:
(II)