According to the Dietary Guidelines, the best choice from the options provided is salmon.
Salmon is a nutritious source of protein and contains omega-3 fatty acids, which are beneficial for heart and brain health. In contrast, the other options may not provide the same level of nutritional benefits. For instance, diet soft drinks may contain artificial sweeteners, frozen yogurt can be high in sugar, and gummy fruit snacks often contain added sugars with little nutritional value.