Answer:
D
Step-by-step explanation:
A: certainly the family is committed. Very few families work that harmoniously. They have 2 households, that's all.
B: A blended family is 2 broken families that have decided to live together and share resources. It is usually a term reserved for remarriage.
C: And this is more than just a single parent family. The two spouses work together in the best interests of the children. They each carry a different load. That's not the usual meaning of a single-parent family.
D: is the answer. The primary-parent model just defines who has the legal responsibility for being the adult in charge. It is usually the mother. The primary parent is the one the school authorities phone when they need an answer to something that is legal in nature.