Cardinal Comics produces graphic historical novels and retails them through local shops throughout the United States. The publisher maintains an in-house staff of editors and illustrators but contracts out writing, printing, and distribution. Its printer uses domestically recycled paper but imports ink and much of its printing equipment from overseas. Segment D of the circular flow diagram above reflects which part of this scenario? a. Cardinal Comics retails novels through local shops. b. Publisher maintains an in-house staff of editors. c. Printer imports ink and printing equipment. d. Consumers pay sales tax on purchase of novels.