Which of the following, if true, most seriously weakens the manufacturer's argument? A. The expense of purchasing the blood-test kits has not prevented any patients from obtaining them or the drug. B. Medical laboratories can perform the blood testing at a lower cost to patients or their insurers than the price the manufacturer charges for the kits. C. A one-year supply of the drug and the weekly blood-test kits can cost patients or their insurers over $10,000. D. Most government and other health insurance programs will not reimburse patients for the full cost of both the drug and the blood-test kits. E. Patients who suffer one or more of the dangerous side effects of the drug can incur heavy expenses for the treatment of those side effects.