Final answer:
Carbohydrates provide approximately 4 calories per gram. Therefore, the correct answer is a.
Step-by-step explanation:
In nutrition, the caloric content of macronutrients is measured in calories per gram (cal/g). The caloric values for macronutrients are:
Carbohydrates: 4 calories per gram
Proteins: 4 calories per gram
Fats: 9 calories per gram
This means that for every gram of carbohydrates consumed, you would be consuming 4 calories.
Therefore, the correct answer is 4 cal/g for carbohydrates. This information is essential for individuals who are conscious of their calorie intake and are considering a weight loss program, as it allows them to make informed choices about their diet and manage their overall energy balance.