Quillium is the most popular blood pressure regulating prescription drug on the market. Giant Pharma, Inc. , the largest prescription drug manufacturer in the country, owns the patent on Quillium. Giant Pharma stock is hitting unprecedented high valuations. As a result, Quillium is by far the most effective drug available in treating irregular blood pressure. Which of the following, if true, most weakens the argument? ["Giant Pharma gouges its customers on Quillium's price.", 'Quillium has numerous alternate applications.', 'The most lucrative and popular pharmaceuticals are not always the most effective.', "Giant Pharma's high stock prices are attributable to recent patent acquisitions other than Quillium."]