Final answer:
The international division of labor showcases strong interdependence among nations option (c) due to the need for cooperation in trade for goods and services, with specialization and economies of scale enhancing productivity.
Step-by-step explanation:
The international division of labor is evidence of strong interdependence between nations because it necessitates cooperation and reliance on each other for goods and services.
This division of labor enhances productivity and economic efficiency through three main points: comparative advantage, increased productivity via specialization and practice, and the exploitation of economies of scale.
As nations specialize in different types of production, they naturally become interdependent, needing to trade with one another to obtain the goods and services that they do not produce themselves.
Globalization has increased the depth of this interdependence, as reduction in trade barriers and improvements in communication and transportation have made international cooperation not only more feasible but also necessary for maintaining and improving standards of living.