“The road you travel from Tana to Cathay [China] is perfectly safe, whether by day or by night, according to what the merchants say who have used it. . . . Cathay is a province which contained a multitude of cities and towns. Among others there is one in particular, that is to say the capital city, to which is great resort of merchants, and in which there is a vast amount of trade; and this city is called Cambalec. And the said city hath a circuit of one hundred miles, and is all full of people and houses and of dwellers in the said city.” -Francesco Pegolotti, The Merchant's Handbook, c. 1471

Which statement about China and trade does this passage best support?