Explanation:

- When an entire way of life is changing due to contact with another culture, it's called Acculturation.

- Diffusion means the spread of cultural traits from one group to another, but not total change of lifestyle.

- Acculturation happens when groups come into continuous contact and cultural changes occur on both sides.

- Assimilation means a minority group fully adopts the dominant culture, losing its original identity. This is a deeper, often final stage after acculturation.

- Socialization is the process by which individuals learn the norms and values of their own society.

Correct Option: 2. Acculturation