Answer :
The answer is "a. mechanoreceptors".
Mechanoreceptors are specific neurons that transmit mechanical twisting data (for example joint revolution because of positional change and movement) into electrical signals. Stimulation of these receptors results in reflex muscle withdrawal about the joint as a versatile control to sudden developments of increasing speed or deceleration.
Mechanoreceptors are found all through the whole respiratory tract. They supply the cerebrum stem respiratory system with data about the mechanical status of the lungs and chest, add to the control of respiratory action, and start defensive reflexes, for example, cough.