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Question 159·Hard·Central Ideas and Details

Until recently, most historians believed that the earliest examples of the Eastron script—a writing system that eventually evolved into several modern alphabets—originated in the bustling trade ports along the kingdom’s eastern coast around 600 BCE. However, archaeologist Mira Al-Sayeed and her team have unearthed a set of pottery shards inscribed with unmistakable Eastron characters from a desert settlement nearly 400 kilometers inland; radiocarbon dating places the shards at roughly 720 BCE.

According to the text, what does the radiocarbon dating of the pottery shards suggest about when the Eastron script first appeared?