A cultural push factor refers to aspects of a person's culture or society that compel individuals to leave their home country or region. Among the options provided, "linguistic suppression" is the best example of a cultural push factor. It reflects a situation where individuals may feel oppressed or marginalized due to their language or cultural identity, prompting them to seek a new environment where they can freely express their cultural and linguistic heritage.
The other options listed—social mobility, climate change, and war—do not specifically pertain to cultural factors, though they can also drive migration in different contexts.