Suppose that a firm operating in perfectly competitive market sells 200 units of output at a price of $3 each. Which of the following statements is correct? (i) Marginal revenue equals $3. (ii) Average revenue equals $600. (iii) Average revenue exceeds marginal revenue, but we don't know by how much. A. (i) only B. (i) and (ii) only C. (i), (ii), and (iii) D. (iii) only