Which of the following most logically completes the argument? Many household items are made with natural components. Since these components can degrade when exposed to light for extended periods, synthetic additives are often included to enhance the longevity and stability of these products. However, these additives can alter the natural properties of the items and may lead to negative effects for users. Therefore, to safeguard consumer health, synthetic additives should not be used in these products, especially since __________.