Which Is One Reason That Sociologist Cite to Explain Why

Which is one reason that sociologist cite to explain why men and women are delaying marriage until their mid-to-late twenties?

A) Many young people place education and career higher than marriage on their list of priorities.
B) Many women fear having children too early and, consequently, having to give up a good career.
C) Most men spend at least a year traveling the world to get a better understanding of the world, and consequently, don't want to be tied down by a wife.
D) Most people in the Millennial generation are caring for their aging parents and do not have time for long term, serious relationships.