Question

A psychologist would most likely use biofeedback to provide clients with information about their body weight. blood type. muscle tension. genetic makeup.

Answer 1

The most appropriate answer is Muscle tension. 
Biofeedback is a technique where a psychologist uses visual or auditory feedback to gain control over involuntary bodily functions. these may include gaining voluntary control over things such as heart rate, muscle tension, blood flow, pain perception and blood pressure.