**Core Concept**
The process of swallowing, also known as deglutition, involves the coordinated movement of multiple organs and structures to transport food from the mouth to the stomach. This complex process is divided into three main phases: oral, pharyngeal, and esophageal.

**Why the Correct Answer is Right**
The oral phase begins with the voluntary initiation of swallowing, where food is chewed and mixed with saliva containing amylase, breaking down carbohydrates into simpler sugars. The bolus is then formed and propelled backward by the tongue, towards the pharynx. The pharyngeal phase is an involuntary process, where the bolus is propelled through the pharynx by the action of the pharyngeal constrictor muscles, and the epiglottis separates the trachea from the esophagus to prevent aspiration. The esophageal phase involves the peristalsis of the esophagus, propelling the bolus into the stomach.

**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because the oral phase is indeed voluntary, whereas the pharyngeal and esophageal phases are involuntary.
**Option B:** This option is incorrect because the epiglottis plays a crucial role in separating the trachea from the esophagus during the pharyngeal phase, preventing aspiration.
**Option C:** This option is incorrect because the esophageal phase is indeed characterized by peristalsis, which propels the bolus into the stomach.

**Clinical Pearl / High-Yield Fact**
It's essential to remember that the swallowing process is a complex, multi-organ process that requires precise coordination to prevent aspiration and ensure proper digestion.

**Correct Answer: None of the above**

✓ Correct Answer: C. Eosophageal phase: under voluntary neuromuscular control and involves peristalsis and relaxation phase.