The correct option is C Oesophagus
The connecting link from the mouth to the stomach is the esophagus. It is a muscular tube that moves the partially digested food from mouth to stomach for further digestion. In humans, the oesophagus is usually 18–25 centimeter long. During swallowing the epiglottis tilts backwards to prevent food from going down the larynx. The esophagus is the only part of the digestive system where no digestion occurs due to lack of enzymes.