Based on the precise nature of Shang dynasty calendars, what can you conclude about Shang society? It made contact with several other advanced cultures. It relied on traders to seek new ideas. It had skilled astronomers. It had a king who was also the high priest.
"It had skilled astronomers" is the best option from the list, since back in these times, astronomical accuracy was necessary in order to be able to accurately predict the movement of the sun and moon and therefore the dates and times.
