Some people have been promoting a new herbal mixture as a remedy for the common cold. The mixture contains, among other things, extracts of the plants purple coneflower and goldenseal. A cold sufferer, skeptical of the claim that the mixture is an effective cold remedy, argued, "Suppose that the mixture were an effective cold remedy. Since most people with colds wish to recover quickly, it follows that almost everybody with a cold would be using it. Ttherefore, since there are many people who have colds but do not use the mixture, it is obviously not effective. " Each of the following is an assumption required by the skeptical cold sufferer's argument EXCEPT: ['The mixture does not have side effects severe enough to make many people who have colds avoid using it.', 'Enough of the mixture is produced to provide the required doses to almost everybody with a cold.', 'There are no effective cold remedies available that many people who have colds prefer to the mixture.', 'The mixture is powerful enough to prevent almost everybody who uses it from contracting any further colds.']