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 large-scale, unpredictable events that create a great deal of stress and feelings of threat. Major life changes can also be stressful, but they are not necessarily unpredictable or large-scale. Hassles are daily annoyances that can also add up and lead to stress. Eustress is a type of stress that is positive in nature, such as the stress experienced during a challenging but enjoyable activity.