​The notion that some people respond more strongly to stress than do others is called

A) ​Type A personality.
B) ​Type B personality.
C) ​reactivity.
D) ​responsivity.

Reactivity refers to the idea that some individuals have a stronger physiological and/or psychological response to stress than others. This can manifest in a variety of ways, including increased heart rate, elevated cortisol levels, and heightened anxiety or depression. This concept has been extensively studied in the field of psychology and can have implications for understanding individual differences in health, well-being, and resilience.