Question

after a person is connected to a system for biofeedback what does the system show?
o any subtle changes in bodily functions
o all major changes in the body
o how much water is in your body
o body mass index

Explanation:

Biofeedback systems are designed to monitor and provide information about bodily functions. They can detect even small, or subtle, changes in things like heart rate, muscle tension, or skin conductance. These subtle changes are what the biofeedback system shows. The body mass index (BMI) is a separate calculation (weight divided by height squared) and not directly what a biofeedback system shows. Measuring "how much water is in your body" is more related to specific hydration tests (like bioelectrical impedance analysis in some cases but not the general function of a biofeedback system). "All major changes in the body" is too broad - biofeedback focuses on specific physiological parameters (often related to the autonomic nervous system - controlled functions like those mentioned above) and not every single major body change (like large - scale organ function changes in a general sense).

Answer:

any subtle changes in bodily functions