Final answer:
A country's membership in international organizations can be measured by its level of political globalization, as it reflects the country's involvement in global politics and international policymaking.
Step-by-step explanation:
The question on measuring globalization through a country's membership in international organizations is related to political globalization. Membership in these organizations often allows countries to participate in collective decision-making, engage in diplomacy, and adhere to international policies, thereby increasing their political connections with other nations. When a country joins international organizations, it reflects its commitment to engaging in global politics, fostering cooperation, and addressing global issues collectively.
While economic and social globalization are also aspects of a country's integration into the global community, they are not directly related to membership in international organizations. Organizational globalization is not a commonly recognized term within the context of globalization studies. Therefore, the correct answer is C. Political Globalization.