The correct option is B Pharynx
The pharynx serves as a part of both the digestive system and the respiratory system. It is a hollow structure lined with moist tissue. It receives air from the nasal passage and also receives air and food from the mouth. The pharynx passes on food to the oesophagus, and air to the larynx.
The trachea is a part of the respiratory system. It is also called the windpipe. It connects the larynx with the bronchi of the lungs.
The larynx is also a part of the respiratory system. It is present above the windpipe and in front of the food pipe (oesophagus).
The oesophagus is a part of the digestive system. It connects the pharynx and the stomach.