Given these foods and their characteristics, which is most appropriately classified as nutrient-dense and why? A) Olive oil: almost entirely monounsaturated fat, high calories, minimal vitamins per gram. B) Grilled salmon: provides omega-3 fatty acids, high-quality protein, vitamins D and B12. C) Milk chocolate bar: high added sugars and saturated fat with some minerals. D) White bread: refined grains, low fiber and few micronutrients.

• A. Grilled salmon, because it supplies essential nutrients (omega-3s, protein, vitamin D, B12) relative to its calories making it nutrient-dense compared with the other options.
• B. Olive oil, because despite calories it is a concentrated source of healthy monounsaturated fats which automatically makes it the most nutrient-dense of the list.
• C. Milk chocolate bar, because it contains sugars that help with rapid energy and therefore qualifies as nutrient-dense when the sugar is metabolized.
• D. White bread, as it supplies refined carbohydrates that are the preferred fuel for the brain and therefore has the highest nutrient density.

Answer: (A)