Critical Reasoning

The President of EMC Pharm. Co. argued that development costs for new generic drugs ordered by the Center for Disease Control should be subsidized by the Health Dept. because the marketing of such drugs promised to be less profitable than marketing of any other product. In support of his claim, the president argued that sales of generic drugs are likely to be lower since each drug is prescribed to a patient only once. Medicines that combat other illnesses and chronic diseases are prescribed many times to each patient.

Which one of the following, if true, most weakens the support offered by the company president for the claim concerning the marketing of generic drugs?

A) Many of the diseases that generic drugs are designed to prevent can be successfully treated by alternative medicines

B) Pharm. Co. occassinally market products that are neither medicines nor generic drugs

C) Generic drugs are administered to many people than most other Pharm. products

D) Pharm. co. other than the EMC Pharm. Co. produce generic drugs

E) The cost of administering a generic drug is rarely borne by the Pharm. Co. that manufactures that drug.

Please help me understand this question and its reasoning for right answer. Thanks a bunch.