Concept:The core guiding objectives of a country in dealing with other nations are known as its national interest.
Explanation:A country's foreign policy is built around its goals and ambitions, which are called national interest.
These interests can be economic, military, cultural, or political.
For example, a nation may seek security, trade benefits, or regional influence through foreign policy.
Since the question asks for the central issues of foreign policy, the correct term is national interest.
Terms like globalisation, state area, and diplomacy are related concepts but do not describe the core issues themselves.
Answer:C. national interest.