A student with oral dysphagia secondary to neuromuscular hypotonicity is most likely to show:

A student with oral dysphagia secondary to neuromuscular hypotonicity would indeed be most likely to show diffuse lingual residue with increased transit time. Neuromuscular hypotonicity refers to reduced muscle tone, which affects the ability of the tongue to effectively propel food toward the pharynx during swallowing. This decreased strength and coordination can lead to inefficiencies in bolus transit time, contributing to the presence of food residue on the tongue after a swallow.

In contrast, other options reflect different swallowing challenges that do not specifically align with the characteristics of hypotonicity. For instance, absent laryngeal elevation is more indicative of issues with the closure of the airway rather than the muscular tone of the tongue. Delayed swallow initiation with coughing suggests a timing issue during the swallow rather than issues with muscle tone. Regurgitation typically entails a failure of the lower esophageal sphincter, which isn't directly related to oral stage dysphagia resulting from hypotonicity. Thus, diffuse lingual residue with increased transit time accurately represents the impact of hypotonicity on swallowing function in this context.