The correct option is C epiglottis
The epiglottis is a flap made of elastic cartilage tissue covered with a mucous membrane, attached to the entrance of the larynx. It stays open during breathing, allowing air to pass through. Glottis is the opening between the vocal cords in the larynx. Pharynx is the part of the throat that is behind the mouth and nasal cavity, and above the oesophagus and the larynx. Trachea is the wind pipe that connects the larynx to the lungs.