What major changes occurred during the postclassical era?

The Post-Classical Era was an era filled with various changes. This include the various dynasties in China including the Sui, Tang and Song. There was also the spread of Buddhism from India through the silk roads into China. Technological changes include the invention of gun powder which transformed warfare

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

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