According to the Text,what Does "Midlife Crisis" Refer To

According to the text,what does "midlife crisis" refer to?

A) a life event that can produce change in the extended family system
B) the depression some women experience when the last child leaves home
C) a period of extreme strain as a person evaluates his or her life in middle age
D) the stress experienced by middle-aged adults who face the disability of their parents