Which factor is NOT listed as influencing language diffusion?

• A. Climate change
• B. Trade
• C. Urbanization
• D. Migration

Answer: (A)

Language diffusion spreads mainly through contact between language communities fostered by social and economic processes. Trade creates long-distance links where languages and loanwords travel along routes as people exchange goods and ideas. Urbanization brings large, diverse populations into closer daily contact, increasing bilingualism and language mixing in cities. Migration moves speakers into new regions, introducing their languages to new audiences and creating opportunities for language adoption or shift. Climate change, while capable of indirectly prompting people to relocate, is not a direct driver of language diffusion itself in most curricula; its influence would emerge only through resulting migrations, not as a primary mechanism spreading language.