Which statement best describes how the mouth and esophagus contribute to digestion before chyme reaches the stomach?

The mouth chemically digests proteins with pepsin and mechanically propels food to the esophagus where segmentation completes digestion

The mouth emulsifies fats using bile-like secretions and the esophagus begins absorption of monosaccharides across its mucosa

The mouth performs mechanical breakdown by chewing and begins chemical digestion with salivary amylase and some lipase; the esophagus propels the resulting bolus to the stomach by coordinated peristaltic waves

The mouth is solely a sensory organ that wets food with saliva but does not introduce enzymes, while the esophagus both digests carbohydrates and stores food