Final answer:
The challenge to global security related to natural resources is the opposition and conflict among countries over obtaining essential resources like water and oil, which can lead to resource wars and international crises.
Step-by-step explanation:
The issue related to natural resources that could challenge global security is c. Countries opposing one another over obtaining resources. Economic development often competes with environmental protection and the goal of sustainable development. Diverse countries vie for resources such as water, fuel, and energy, and the need for these resources can lead to disagreements and conflicts among nations. The scarcity of resources like water in Sub-Saharan Africa, and the potential for a future crisis in Asia and Africa due to pollution and depletion, highlights the seriousness of these diplomatic and security challenges. Moreover, the absence of global authority makes it difficult to address these problems collectively, as nations prioritize their own interests. The concept of a resource war is not far-fetched when one considers the global dependence on resources like oil and the consequences of their scarcity on international relations and security.