D. The percentage of muscle and body fat is often defined as the mass of the body which is why this is taken into account when measuring the BMI for children and teens. It might not use all of the fat, but some parts of it is needed to measure the mass effectively.
Attention to detail and timeliness are important skills for this. Also, one must be non-judgmental and impartial.
Mental and emotional you need to be a genuine good person
