For nutritional assessment at a macro level, such as evaluating an entire country or a large geographic region, which of the following methods is predominantly used?

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: The Waist-to-Height Ratio (WHtR) is the standard anthropometric tool primarily used to measure the growth velocity of skeletal limb lengths in adolescents. Reason R: By specifically measuring abdominal obesity relative to vertical stature, the WHtR acts as a highly effective and often superior predictor of metabolic disease risks. In the light of the above statements, choose the most appropriate answer from the options given below:

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R Assertion A: The Body Mass Index (BMI) is mathematically determined by dividing an individual's body weight in kilograms by their total height measured in centimeters. Reason R: BMI provides a standardized scale used universally to classify individuals into categories of underweight, normal weight, and varying degrees of obesity. In the light of the above statements, choose the most appropriate answer from the options given below: