Answer:
A) Golgi tendon organ.
Step-by-step explanation:
A tendon organ or neurotendinous organ or Golgi tendon organ is a mechanoreceptor located at the insertion point of the skeletal muscle to the tendon that is at the myotendinous junction.
The Golgi tendon organ is composed of the collagenous muscle fibres which contain the receptors which sense the contraction of active stretch of the muscles and sends it to the brain. The brain sends the response and the muscle act by the inverse myotatic reflex.
Thus, Option-A is the correct answer.