Final answer:
During the pharyngeal phase of deglutition, the larynx elevates and the uvula rises to prevent food from entering the respiratory pathways, not the laryngopharynx, although the epiglottis does fold down to cover the glottis. Thus, the option c is the correct answer.
Step-by-step explanation:
During the pharyngeal phase of deglutition (swallowing), several actions occur to safely direct the bolus towards the esophagus and away from the respiratory pathways. Option (a) is incorrect because it is the uvula that rises to block the nasopharynx, not the laryngopharynx. Option (b), the bolus entering the oropharynx, is part of the earlier voluntary phase, not the pharyngeal phase. Option (c) is correct as the larynx elevates to facilitate the closing of the glottis by the epiglottis. For option (d), the phrasing is incorrect as the epiglottis folds down to prevent food from entering the larynx, not allow it. Thus, the correct events that occur during the pharyngeal phase include the upward movement of the uvula to close off the nasopharynx, the elevation of the larynx, and the constriction by the pharyngeal constrictor muscles, which guide the bolus into the esophagus.