A BMI of 21.7 kg/m2 is classified as:

A. Overweight: Overweight is defined as a BMI of 25–29.9 kg/m². A BMI of 21.7 falls below this range, so it does not indicate overweight. B. Normal: A BMI between 18.5 and 24.9 kg/m² is considered within the normal or healthy weight range. A BMI of 21.7 kg/m² falls squarely within this classification, indicating a healthy body weight relative to height. C. Obese, Class II: Class II obesity corresponds to a BMI of 35–39.9 kg/m². A BMI of 21.7 is well below this threshold and does not indicate obesity. D. Obese, Class I: Class I obesity is defined as a BMI of 30–34.9 kg/m². A BMI of 21.7 does not meet this criterion and is therefore not classified as obese.