The best example of culture diffusion is the spread of Christianity into the new world because of European exploration and missionary work.
The correct option is (a).
What is cultural diffusion?
Culture diffusion means the spread of different culture practice to different areas. The introduction of one's beliefs, customs, practice to a new area.
An example is the German Christmas pickle becoming famous in the United States.
Thus, option (A) the introduction of Christianity in the new worlds by Europeans and missionary work is correct for cultural diffusion.
Learn more about cultural diffusion, here:
https://brainly.com/question/2035730
