The passage reveals which of the following trends from the period 1200 to 1450?
A. Widespread hostility toward trade with outsiders was being supported by the state.
B. The state was sponsoring innovative commercial practices and infrastructure to encourage trade.
C. Luxury goods and products became accessible to the middle and lower classes.
D. Economies were declining throughout Eurasia as a result of Mongol invasions.
Refer to the passage.
Furthermore all merchants arriving from India or other countries, and bringing with them gold or silver or gems and pearls, are prohibited from selling to any one but the Emperor. He has twelve experts chosen for this business, men of shrewdness and experience in such affairs; these appraise the articles, and the Emperor then pays a liberal price for them in those pieces of paper. The merchants accept his price readily, for in the first place they would not get so good a one from anybody else, and secondly they are paid without any delay. And with this paper-money they can buy what they like anywhere over the Empire, whilst it is also vastly lighter to carry about on their journeys. And it is a truth that the merchants will several times in the year bring wares to the amount of 400,000 bezants, and the Grand Sire pays for all in that paper.
Excerpt from The Book of Ser Marco Polo, the Venetian, Concerning Kingdoms and Marvels of the East, Vol. 2, 1871