Read the following excerpt from "letter to george iii, 1793" by emperor qian long: [a]s the tea, silk and porcelain which the celestial empire produces, are absolute necessities to european nations and to yourselves, we have permitted, as a signal mark of favour, that foreign [merchant firms] should be established at canton, so that . . your country thus participate in our beneficence. which words in the text most clearly show a superior attitude? a. participate in our beneficenceb. should be established at cantonc. the celestial empire producesd. necessities to european nations