Which term describes the protection of a nation's borders and territories against invasion or control by foreign powers?

• A. National security
• B. Global communication
• C. International trade
• D. Environmentalism

Answer: (A)

National security centers on protecting a nation's borders, sovereignty, and political independence from invasion or foreign control. It covers military readiness, border defenses, intelligence, and diplomacy—measures taken to deter threats and respond to aggression. That makes it the best term for describing protection of borders and territories. By contrast, global communication is about sharing information across borders, international trade concerns the exchange of goods and services, and environmentalism focuses on protecting natural resources and ecosystems. None of these specifically addresses safeguarding a country’s territory from external domination.