The relationship between beer and human health has always been of concern to scientists. Because women's finger bones will first show osteoporosis symptoms, researchers chose to scan their phalanx with ultrasound imaging. The scan results show that women who drink beer often do not Of women have significantly different bone mineral density, the former has a higher bone density than the latter. So researchers believe that beer helps women prevent osteoporosis. Which of the following, if true, would most weaken the above conclusion? ['Most women who have the habit of drinking beer like to participate in sports. They are physically strong and their bone density is relatively high.', 'Whether the daidzein contained in beer can effectively prevent bone aging needs further study.', 'Alcohol in beer is not conducive to the absorption of calcium, and calcium deficiency can lead to skeletal dysplasia.', 'Women who drink 200 ml of beer a day have a higher bone density than women who drink 500 ml of beer a day.']