Question

What is the best example of cultural diffusion?

Bjorg invites his friend Carlos over for a home-cooked Swedish meal.
Sandy explains the Chanukah dreidel game, and then her class plays it.
The Spanish forced Christianity on the Native Americans when they conquered parts of South America.
When colonists fought the British during the American Revolution, they also resisted the British culture.

Answer 1

"Sandy explains the Chanukah dreidel game, and then her class plays it."

Reason: cultural diffusion is the spread of cultural ideas, practices, or products from one group to another. Sandy teaching the dreidel and the class adopting it is a clear, voluntary example of that spread. The Spanish forcing Christianity is imposed cultural change (assimilation), Bjorg hosting a Swedish meal is also diffusion but on a smaller, individual scale, and the colonists resisting British culture is the opposite of diffusion.