The equations for a competitive market's demand and supply curves are, respectively, Qᴰ = 1000 - 5p and Qˢ = 3p. A price ceiling is imposed upon the market at the level of $100/ commodity unit. The quantity traded in this market is (a) 200 units. (b) 300 units. (c) 400 units. (d) 500 units. (e) None of the above."