Assume that the advocate has offered the following arguments on behalf of the proposition: Our school should institute a system of textbook rentals for all courses. I. The cost of college textbooks has increased by over 200% in the last decade. II. A combination of the sale of used textbooks by university bookstores and the practice of "bundling" software and audio-video packages is responsible for the increasing costs of college textbooks. III. Authors of college textbooks, such as the one you are using in this course, receive 10% in royalties on the wholesale price of each new textbook sold. IV. College students, already paying increased tuition and housing fees, go further into debt to pay for increasingly expensive textbooks. Which claim in the example suggests inherency