Answer: B. Cannon-Bard
Explanation: According to this theory, an external event or stimulus causes a physiological change in the body but at the same time with an emotion, which is different from some other theories where emotions occur as a result of a physiological change due to an external event. As stated here, when Andrew heard the sharp crack of the twig he felt emotion, he froze with fear, and at the same time physiological change, a loud throbbing of the heart.