A New Nurse Mentions,"I Can Understand a Situational Crisis Upsetting

A new nurse mentions,"I can understand a situational crisis upsetting a person's equilibrium,but I don't understand how something positive,like getting married or having a baby,can precipitate a crisis." To explain,the mentor should answer,"You need to think of a crisis as a(n) :

A) Threat to survival."
B) Threat to the familiar."
C) Opportunity to learn."
D) Psychiatric disorder."