The behavioral perspective is the idea of psychology. This involves the measurable physical responses towards an environmental stimuli. This focuses on the behavior of the subject. The behavioral principle have been applied to determine the mental health of the person in therapeutic treatment and psychiatric counselling sessions. This perspective helps to explain and treat the diseases or disorders.
The behavioral perspective are the responses of the conditioning processes and the behavior is a learned response. Operant conditioning is a kind of learning in this the motivation is required to observe the behavioral response in subjects. In classical conditioning the conditioned stimulus that is the stimulus whose response is required to be known is paired with the unconditioned neutral stimulus. The unconditioned stimulus will increase the tendency of responses that may come for the conditioned stimulus. For example, the smell of food is the unconditioned stimulus and food is the conditioned stimulus. The smell of food can be attractive for the subject.
Moreover the individual learn to behave towards the environmental stimulus by observing others. Thus this can be said that behavior is learned through observational learning.
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.