Acculturation refers to the process of adopting the cultural traits or social patterns of another group, while still retaining aspects of one's original culture.
In this context, the best example of acculturation among the provided responses is:
Learning to prepare food eaten in their new country.
This indicates an adoption of new cultural practices while possibly still having a connection to one’s original food traditions. The other options primarily reflect either a complete change in cultural identity or a maintenance of original culture without integration.