Final answer:
The correct option is (a), Body Mass Index (BMI) is a measure used to determine if a person is in a healthy weight range and is considered to be the subject of this question. The BMI ranges from 18.5 to 24.9 are considered to be healthy or normal weight.
Step-by-step explanation:
The subject of this question is Body Mass Index (BMI) and it is a measure used to determine if a person is in a healthy weight range.
The BMI ranges from 18.5 to 24.9 are considered to be healthy or normal weight. Both the BMI and waist circumference can be used to assess health.