I would go for (4).
The trials aimed at eliminating the excuse of.."doing my duty as ordered by my superiors" in matters of war crimes in particular against humanity (genocide, extermination, violence and retaliation against civilians, etc.)
A picture would be helpful
Marco Polo was deeply impressed by the East. As a european from the XIII century, he wasn't used to the sight of so much trade, luxury and comfort. He travelled through the whole Silk Road, but it was China, and especially its capital Beijing, what made the biggest impression on him. On this excerpt he describes the city as A large city with vibrant foreign trade.
Answer:
Another way that the two new superpowers differed was their economic policies (capitalism in the US, communism in the USSR) and their governmental systems (democratic republic in the US, totalitarianism in the USSR).