We have to distinguish all three processes before you can apply your personal experience. Cultural diffusion is the process of one culture influencing another in a positive way by adopting or copying it. However, Cultural appropriation is a term for cultural diffusion that is seen as disrespectful or mocking and can be linked to racism. So, it has a negative connotation. Cultural assimilation occurs when a minority enters into a dominate culture and assimilates in order to survive. It is a one way process in which dominant culture always wins. The American society is a good example of cultural assimilation of minority groups.
I think the answer is 1 or 2
