The oral phase of swallowing is under control and the pharyngo-esophageal phase is

B. central nervous system; controlled by autonomic reflexes

Answer choices are:

A. central nervous system; also controlled by the central nervous system
B. central nervous system; controlled by autonomic reflexes
C. autonomic nervous system; controlled by autonomic reflexes
D. voluntary; also voluntary
E. involuntary; also involuntary. 

Swallowing has three phases which have different control systems. The oral phase of swallowing is under  the central nervous system control and the pharyngo-esophageal phase is controlled by autonomic reflexes

The oral phase of swallowing is under voluntary control and the pharyngo-esophageal phase is under is controlled by autonomic reflexes. Oral or buccal phase is the voluntary part of swallowing, the food is moistened with saliva and chewed, food bolus is formed and the tongue pushes it back of the throat. The pharyngo-esophageal phase is initiated by touch receptors in the pharynx as the bolus of food is pushed to the back of the mouth by the tongue, or by stimulation of the palate.

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