Nations that have little interaction with one another have little knowledge of one another' s needs and problems. Because both sympathy and justice depend largely on understanding the needs and problems of others, it follows that__. Which one of the following most logically completes the argument? ["only nations that have some interaction with one another have knowledge of one another's needs and problems", 'without some interaction, nations are bound to find it difficult to extend sympathy and justice to one another', 'there is no way to eliminate conflict among nations', 'almost all problems between nations stem from lack of sympathy and justice']