Which of the following is the term used to describe unpredictable, large-scale events that create a great deal of stress and feelings of threat?

A) major life changes
B) catastrophes
C) hassles
D) eustress

Catastrophes are unpredictable, large-scale events such as natural disasters, terrorist attacks, or mass shootings that create a great deal of stress and feelings of threat. Major life changes and hassles are stressors as well, but they are not necessarily unpredictable or on a large scale. Eustress, on the other hand, refers to positive stress that motivates and energizes individuals.