Read the passage. In this city there are 12 guilds of different crafts, and each guild has 12,000 houses in the occupation of its workmen. Each of these houses contains at least 12 men, while some contain 20 and some 40, including the apprentices who work under the masters. All these craftsmen had full employment since many other cities of the kingdom are supplied by this city.

–The Travels of Marco Polo,
Rustichello da Pisa

How might this passage have encouraged trade between China and Europe?

by showing that overland and sea routes to China already existed
by demonstrating that the guilds in China needed foreign workers
by suggesting there was a wealth and a variety of goods available in China
by revealing that China needed more resources and luxury goods