Final answer:
The Golgi tendon organ's primary function is to detect the force of muscle contractions, aiding in muscle proprioception and preventing potential muscle damage.
Step-by-step explanation:
The primary function of a Golgi tendon organ is C) Muscle proprioception. The primary function of a Golgi tendon organ is to serve as a tension receptor that detects the force of muscle contraction. These organs are involved in the process of proprioception, which refers to the body's ability to perceive its own position in space. When muscles contract, the Golgi tendon organs sense the level of tension within the tendons and can trigger a reflex response to prevent muscle damage from excessive force. This function is essential for maintaining muscle proprioception and preventing injuries.