Internet-bound traffic normally uses the default route when no more specific route matches the destination. In an IPv4 routing table, the default route is 0.0.0.0/0. The /0 prefix means it matches every IPv4 destination, but only after the router fails to find a more specific match. That matters: routers do not simply use the default route first. They perform longest-prefix matching, so connected, static, OSPF, EIGRP, or other learned specific routes win before 0.0.0.0/0 is considered. Cisco CCNA 200-301 v1.1 IP Connectivity expects engineers to distinguish host routes, network routes, floating static routes, and default routes. Here, the wording asks which path is used for Internet traffic, not traffic to a listed internal subnet. The available answer that represents a catch-all Internet path is 0.0.0.0/0. The other prefixes are specific networks and cannot represent all unknown destinations. Therefore, C is the correct choice.