Stress has been considered as​

A) ​a stimulus.
B) ​a response.
C) ​interaction of stimulus and response.
D) ​all of these.

Interaction of Stimulus

The process by which multiple stimuli interact, influencing and altering an individual's response or behavior.

Stimulus

Any external event or circumstance that has the potential to elicit a reaction from our sensory systems or psychological responses.

Response

The reaction of an organism or system to a specific stimulus or situation.