The majority of shang dynasty writing was done on
papyrus
paper
clay
bamboo

The majority of Shang Dynasty writing was done of bamboo. The correct answer is the final option. The people wrote on bamboo because other materials for writing hadn't yet been discovered. It took a while until papyrus, let alone paper was discovered for writing purposes. Although paper was indeed discovered in China, it didn't happen until 25 AD, by Cai Lun.

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