A cultural push factor refers to social, cultural, or religious issues that drive people away from their home country or community. Among the options you provided, "linguistic suppression" best describes a cultural push factor.
- War is primarily a political or security push factor.
- Social mobility can be seen as a positive aspect and is generally considered a pull factor, as it represents the opportunities available elsewhere rather than the drawbacks of the current situation.
- Climate change is an environmental factor, rather than a cultural one.
So, the correct response is linguistic suppression.