Final answer:
The global level of analysis is particularly unpredictable in the international system due to the absence of a central governing authority that enforces rules or norms consistently.
Step-by-step explanation:
The anarchic nature of the international system refers to the lack of a central authority that governs state interactions and enforces rules consistently. Within this context, the level of analysis that is particularly unpredictable is d. Global. This level of analysis is unpredictable because it encompasses the broad interplay of all states and non-state actors, the varied interests and actions that shape international relations, and the absence of overarching control that would lend predictability to international affairs.