"Silk making and bronze casting" would be the best option from the list since not only was silk a major part of their own economy, but they traded it extensively which made it a great part of the European economy.
The right answer is "silk making and bronze casting".
Here a quick explanation:
Under the Shang dynasty, the Chinese built large cities with strong social class divisions, expanded irrigation systems, fabricated silk, and monopolized the use of bronze.
