Final answer:
The structure of families varies across cultures and societies, and it has changed over time in different societies.
Step-by-step explanation:
The structure of families varies across cultures and societies.
In many Asian cultures, multiple generations often live together in one household, while in the United States, individuals are expected to live independently before forming a nuclear family.
Overall, the structure of families is not the same all over the world and has changed over time in different societies, making option d. None of the answers is correct.