Which device or method is attached to a person's body to restrict movement for treatment purposes?

The correct answer is physical restraint, as it specifically refers to a device or method used to limit a person's movement for treatment purposes. Physical restraints are typically employed in clinical settings to prevent patients from harming themselves or others during a medical procedure or in response to certain behaviors associated with various health conditions.

This practice is usually implemented with a clear clinical rationale and is subject to strict guidelines to ensure the safety and dignity of individuals being restrained. The goal is to manage situations where patient security or safety is at risk, typically while ensuring that the least restrictive measures are utilized first.

In contrast, support braces are designed to provide stability to an injured area of the body or assist with movement rather than restrict it. Therapeutic exercise refers to activities intended to enhance a person's physical health and mobility rather than limit movement. Mobility aids, such as walkers, canes, or wheelchairs, are used to assist individuals in moving more freely, which is the opposite of restricting movement. Thus, the distinguishing characteristic of physical restraint is its specific purpose of restricting movement for safety and treatment, making it the correct choice in this context.