How did communication improve during the Qin dynasty? O A standardized writing system was created.
O An organized postal system was established.
O A new system of military message codes was developed.
A ban against criticizing the government was passed.

During the Qin Dynasty, paper began to be invented and the writing system of China was standardized.

Explanation:

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this isn't a question and if you're going to list things be kind and use commas.