Question ID:PT19 S4 Q15 Passage:Grow-Again ointment is a proven treatment for reversing male hereditary baldness.  Five drops daily is the recommended dose, and exceeding this quantity does not increase the product's effectiveness.  Therefore, offering a manufacturer's rebate on the purchase price of Grow-Again will not increase sales and consequently would be unprofitable for the manufacturer. Stem:Which one of the following, if true, would most strengthen the argument? Correct Answer Choice:CChoice A:When using an ointment, people tend to believe that applying it in greater quantities can make it more effective. Choice B:Grow-Again is more effective on some of the men who use it than it is on others. Choice C:The rebate, if offered, would not attract purchasers who otherwise might not use Grow-Again. Choice D:Baldness in men can be caused by a variety of factors, only one of which is heredity. Choice E:Grow-Again is a product whose per-unit manufacturing cost does not fall significantly when the product is produced in large quantities.