Final answer:
The use of BMI to assess weight and risk of chronic disease is most useful for adults.
Step-by-step explanation:
The use of BMI to assess weight and risk of chronic disease is most useful for Option 1: Adults. BMI, or Body Mass Index, is a measurement calculated by dividing a person's weight in kilograms by the square of their height in meters. It provides an estimate of body fatness and is commonly used to classify individuals as underweight, normal weight, overweight, or obese. However, it's important to note that BMI has its limitations and may not be the most accurate tool for assessing the health of individuals, especially in determining factors such as muscle mass and fitness level.