The author includes the information that "surplus was not a result of domestic craft production but resulted primarily from international trading" in order to A. Support the claim that the mode of production made possible by the craft guilds was very good for trade B. Contrast the economic base of the city government with that of the tribal confederacies C. Provide a reason why the government allowed the guilds to be self-controlled D. Suggest that the government was missing out on a valuable opportunity to tax the guilds