Final answer:
Whole grain bread is likely the food with the lowest glycemic index (GI) score among common carbohydrate sources, due to its complex carbohydrate and fiber content which slows digestion and stabilizes blood sugar.
Step-by-step explanation:
The carbohydrate food with the lowest glycemic index (GI) score among those mentioned would likely be whole grain bread. While the exact GI score is not provided, whole grain breads, being a source of complex carbohydrates, generally have lower GI scores compared to white bread or other refined carbohydrate sources. Fiber content in whole grains tends to slow down the digestion process, translating to a more gradual rise in blood sugar levels. Carbohydrates are essential for energy supply, with one gram providing 4 Calories of energy.
Therefore, the food choice with the lowest GI from the options would most likely be a carbohydrate source high in fiber and complex carbohydrates, such as whole grain bread, as opposed to a carbohydrate source with more simple sugars or processed grains.