The correct option is D W: Oesophagus; X: Epiglottis; Y: Larynx; Z: Trachea
Oesophagus is also known as the food pipe. It connects the buccal cavity to the stomach.
Epiglottis is a small, movable ‘lid’ just above the larynx, which prevents food and drink from entering the windpipe. The larynx, commonly called the voice box or glottis, is the passageway for air between the pharynx above and the trachea below.
The trachea, also known as the windpipe, is a cartilaginous tube that connects the larynx to the bronchi of the lungs.