The correct option is A Oesophagus and stomach
The oral cavity leads into a short pharynx present in the neck region, where the oesophagus originates. The oesophagus is a thin, long tube which passes through the neck, chest region and diaphragm, and leads to a ‘J’-shaped bag-like structure called the stomach. The muscular gastro-oesophageal sphincter regulates the opening of the oesophagus into the stomach. The bulk of the digestion begins here.