The correct answer is b-forming neighborhood militilas
Historian Odd Arne Westad says the Communists won the Civil War because they made fewer military mistakes than Chiang Kai-shek and also because in his search for a powerful centralized government, Chiang antagonized too many interest groups in China. Furthermore, his party was weakened in the war against the Japanese.
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Well the Tang made China's government stronger. They went back to using the civil service examinations for choosing government officials. Government officials could no longer use family connections to get them jobs. They also gave land to farmers and brought back order to the countryside. The effects helped China rebuild itself, offering better standers of living to its people.