Walter Cannon (1932) was one of the first theorists to describe which physiological reaction to threat

A)  the fight-flight response
B)  the tend-befriend response 
C)  the task-performance response
D)  the optimal-arousal response

Walter Cannon was one of the pioneers in studying the physiological response to threat. He coined the term "fight-flight response" to describe the automatic physiological reactions that occur in response to a perceived threat or danger. This response is characterized by an increase in heart rate, blood pressure, and respiration, as well as the release of stress hormones such as adrenaline and cortisol. These reactions prepare the body to fight or flee from the perceived threat.