Final answer:
The Ming emperors' strategy of confining craftsmen within the Forbidden City served to b. preserve and exert control over their craftsmanship, ensuring that the emperor could project power and wealth internally and externally.
Step-by-step explanation:
The strategy mentioned in the statement, where Ming emperors kept all craftsmen, architects, and artisans locked in the Forbidden City and controlled their craftsmanship, was primarily to preserve and control craftsmanship (Option b).
The purpose was not focused on promoting collaboration among artisans or encouraging public appreciation, and it was less about facilitating trade with foreign nations since, during that period, China was becoming increasingly isolated.
Moreover, the artworks created were to convey an image of China's power, wealth, and magnificence, not necessarily for public display or external trade purposes.