Roberta Married for the First Time at Age 39,and at Age

Multiple Choice

Roberta married for the first time at age 39,and at age 40 she is pregnant for the first time.She is now considering starting college to become a computer systems engineer.When Roberta laughingly tells her friends,"I have never done anything when I was supposed to!" what is she referring to?

A) Her social clock
B) Her biological clock
C) Her psychological clock
D) A critical period