The answer is option 3: A technique for making porcelain was perfected.
The art of making porcelain prospered in both periods. A lot of innovations were made in forms, glazes, decorative techniques methods of production and kiln technology.
During the Tang Dynasty, porcelain kilns were constructed all over the country and a type of vessel with molded decorations on it became very popular, which was made using an "upside down" and the coal was used as kiln fuel.
By the Song period, the manufacturing process was standardized (base-making, glazing, ingredient control, and temperature maintenance). In addition, the industry was divided into five types of kilns that had several features for glaze coloring and pattern design.
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The GI bill effected the education for veterans because it supplied them with $500 a year so that they could pay for school.
Hopefully this helps :)
World War 2 started in 1939, when Nazi Germany invaded Poland
Advantages:
Natural barriers
Powerful empire
Protection from enemies
Resources
Disadvantages:
Living in tall mountain range
Elevation sickness
Traveling is dangerous
