The correct answer is D) more families include two parents that work outside of the home than in the 1950s.
The statement that is true about how the family structure has changed in the US since the 1950s is “more families include two parents that work outside of the home than in the 1950s.”
One of the most notorious things in modern families in America is that the Father and the mother are educated people that want or need to have a job in order to help their families. Many of these parents attended middle or high school and they know how to do something in the labor market. This way, both can have an income that can be applied in education for their children, health services and other commodities that can be possible thanks to both parents having a job.