Step 1: Understanding the Concept:
International agencies are established with specific mandates to address global challenges, ranging from security and human rights to trade and public health.
Step 2: Detailed Explanation:
Matching each international agency to its corresponding primary function:
- IAEA (A): The International Atomic Energy Agency is responsible for the safety and peaceful use of nuclear energy (1) and ensuring it is not used for military purposes.
- Amnesty International (B): This non-governmental organization (NGO) focuses on the protection of human rights (2) across the globe.
- WTO (C): The World Trade Organization deals with the rules of global trade (3) between nations to keep it smooth and predictable.
- WHO (D): The World Health Organization is the directing and coordinating authority for global health issues (4) and international medical response.
Step 3: Final Answer:
The matches follow the numerical sequence A-1, B-2, C-3, and D-4.
Therefore, option (A) is correct.