Sensory supply of Larynk below vocal cord: (A) Extereal branch of superior laryngeal nerve, (B) Internal branch of Inferior laryngeal nerve, (C) Recurrent laryngeal narve, (D) Inferior pharyngeal nerve
Answer is C. Sensory supply larynx :

Above VC = Internal branch of superor laryngeal nerve.
Below VC = Recurent laryngael nerve.