Passage Summary: If countries don't talk, they won't understand each other; since you need understanding to be fair or kind, isolated countries won't be fair or kind to one another.

Conclusion: Nations that do not interact with one another are unlikely to treat each other with sympathy or justice.

Reasoning: Interaction is required for nations to understand each other's needs, and such understanding is a necessary foundation for both sympathy and justice.

Analysis: This argument follows a clear conditional chain: Interaction is needed for Knowledge, and Knowledge is needed for Sympathy/Justice. If you take away the first step (Interaction), the rest of the chain collapses. To complete the argument, we simply need to draw the logical inference that a lack of interaction leads to a lack of sympathy and justice. Look for an answer that connects these two ends of the chain.