Of the Following Individuals, Who Is Least Typical of Parents

Of the following individuals, who is least typical of parents today?

A) Joshua and Heather decide to wait until she finishes college and he gets promoted before they begin a family
B) Heidi plans to have a child via artificial insemination and accept the challenges of a single parent
C) Joan and Ammon are getting married in a month and plan to have their first child within a year if possible
D) Kaili and his wife, Kattaryna, don't consider children necessary for them to have a complete and happy marriage