Point some of the reasons for The Tang and Song dynasties' vibrant economies. Group of answer choices

the invention of gunpowder, the creation of movable type, the invention of the Hangul alphabet, the creation of reservoirs and intricate irrigation systems

the invention of gunpowder, the creation of reservoirs and intricate irrigation systems, the new techniques to create high-quality porcelain ceramics, its increased reliance on civil servant bureaucracy

the creation of reservoirs and intricate irrigation systems, the expansion into Vietnam that created a dual rice-growing season, advances in agricultural experimentation, techniques to create high-quality porcelain ceramics, the invention of gunpower

the invention of gunpowder, the creation of movable type, the invention of the Hangul alphabet, the creation of reservoirs and intricate irrigation systems, the social services provided to local communities