Answer:
D. It's the most plausible answer, plus I'm studying the Cold War too.
I believe the answer is: B.because of advances in science, medicine, technology, and the arts
During the hand civilization, China developed many advancement in use of herbs for medicinal purpose and adopted many technology from all across the world which increase their agricultural production capacity.
Their artworks were also developed to the point where it became a hot commodity among European nobles.
Entente-UK Canada Australia New Zealand British Malaya Russia
Central powers-Germany Austria-hungry
The answer is the first one, crime statistics of youth in cities that have curfews. If crime rates are lower, the curfew most likely works.
