Which of the following was a focus of Passage 2 regarding food additives?

The correct answer indicates that Passage 2 focused on how food additives are used to enhance the appearance and taste of food. This is a significant aspect of food additives, as they are often incorporated into products to make them more visually appealing and flavorful, thereby improving the overall consumer experience. Many food manufacturers use additives for this purpose, making it a relevant topic in discussions about food production and marketing.

The other options, while they may relate to additives in a broader context, do not specifically capture the main focus of the passage. Historical use pertains to the timeline and evolution of additives, legal regulations would involve the laws and guidelines that govern their use, and public health concerns would discuss the potential risks these additives could pose to health. However, the emphasis of the passage in question centered specifically on the enhancement of food through additives, thereby making the correct choice the one related to their role in improving food's sensory qualities.