Answer: The Cannon-Bard theory
Explanation: The Cannon-Bard theory of emotion states that both emotional experience and psychological arousal is activated (happens) at the same time when when triggered by a stimulus. It shows that people experience both fear and physical reaction at the same time when triggered by a stimulus.
When Bradley heard the door slammed, he was scared and at the same time physically aroused (defence mode), this situation explains the The Cannon-Bard theory of emotion.