That Answer is Incorrect. The correct answers are:
Nations must cooperate to bring about and maintain world peace.
Nations must not wage wars or commit war crimes in a desire to control other nations.
According to me, all of his policies were not successful. They had disadvantages which changed the world
Explanation:
The fundamental modernization of ribbed groin vaults in Gothic cathedrals was to accommodate stained glass window. The ribbed groin vault is the connection of two or three barrel vaults yields a rib vault or ribbed vault when they are bordered with an armature of piped masonry often engraved in decorative patterns and associate groin vault is an older custom of vault structure.
The answer would be 8. Use pemdas.