Answer: The correct answer is- B. observation of healthy individuals.
Adequate Intakes (AIs) can be described as an average value of daily nutrient intake, which is based on experimentally derived approximate value of nutrients for a group of healthy people.
They correspond to the average requirement of nutrients ( such as carbohydrates, fats, proteins) that are essential for a healthy lifestyle of an individual.
Thus, option B) is the right answer.
