Which is a prime example of language diffusion?

The spread of English via the Internet exemplifies language diffusion because it illustrates how a language can expand its reach and influence across different cultures and geographic areas through a modern medium. As the Internet has grown, English has become the dominant language online, leading to its adoption by non-native speakers for communication, content creation, and business. This diffusion occurs through various platforms such as social media, websites, and online learning, where users from diverse linguistic backgrounds interact, share information, and create content predominantly in English.

The other options, while demonstrating significant linguistic influence and change, represent localized or specific instances of language use rather than the broader, global phenomenon of diffusion that occurs via the Internet. The spread of French in Canada and the use of Spanish in the United States reflect regional language maintenance and migration patterns, while the adoption of Mandarin in global business pertains more to economic trends rather than a widespread diffusion process akin to that of English online.