A clothing manufacturer reports that unsalable garments, those found to be defective by inspectors plus those returned by retailers, total 7 percent of the garments produced. Further, it reports that all of its unsalable garments are recycled as scrap, but the percentage of garments reported as recycled scrap is 9 percent. Which one of the following, if true, could contribute most to explaining the discrepancy between the reported percentages? ['The total number of garments produced by the manufacturer has increased slightly over the past year.', 'Some inspectors, in order to appear more efficient, tend to overreport defects.', 'Garments with minor blemishes are sent to wholesale outlets for sale at discounted prices and are not returned for recycling.', 'Insalable garments are recorded by count, but recycled garments are recorded by weight.']