Question

What is a stressor?

a. ​a stimulus that serves as a source of stress
b. ​any event that generates a statistically uniform response among a general population
c. ​a byproduct of stress
d. ​a negative life event that causes physical illness or psychological disorder?

Answer 1

The answer is A. This is an ecological condition, external stimulus or an occasion that creates pressure to a living being.
An occasion that triggers the pressure reaction may include:
natural stressors
every day stretch occasions
life changes
work environment stressors
compound stressors
social stressor