Verified Answer :

The answer is b. assimilation

It refer to a process in which two cultures or more became synchronized with one another.

For example, Turkey is a place where middle eastern and European culture colliding with each other. Creating a some sort of Islamic culture that is more liberal compared to the one in middle east.

Hagrid

The way in which people absorb
outside cultures is called assimilation. This usually happens in places wherein
it is needed to adapt what is political relevant or considered to be superior.
This can happen spontaneously or forcibly. It may be in a form of older culture
integrating other weak culture.