The correct option is B Epiglottis
A leaf-like cartilaginous structure present at the begining of larynx is called epiglottis. The epiglottis guards the entry of larynx from food entering the wind pipe. Pharynx is the common point where the food and wind pipe divide. The trachea is made up of strong, flexible tissues called cartilaginous rings which prevents the wind pipe from colapsing.