Final answer:
Sugary soft drinks are considered "empty-calorie" foods because they offer a lot of calories from sugars with little nutritional benefit, which is in contrast to nutrient-dense options that can support weight loss.
Step-by-step explanation:
An "empty-calorie" food is one that provides energy primarily in the form of added sugars and unhealthy fats but little to no nutritional value, such as essential vitamins, minerals, or fiber. Amongst the choices given, D) Sugary soft drinks are classified as "empty-calorie" foods because they are high in added sugars and contribute extra calories without providing significant nutritional benefits.
On the other hand, eating more nutrient-dense foods, which include fresh fruits and vegetables, whole grains, lean protein sources, and low-fat dairy products, can aid in weight loss while providing the body with essential nutrients.