Final answer:
The lateral view is the correct option for viewing the lateral pharyngeal walls, which is particularly useful for examining the laryngopharynx and vocal cords.
Step-by-step explanation:
The view used to observe the lateral pharyngeal walls is the lateral view. When imaging the pharynx region, this particular view allows healthcare providers to see the structures that are positioned on the sides of the pharynx. The lateral view is especially useful for visualizing areas like the laryngopharynx, which is situated inferior to the oropharynx and posterior to the larynx, as well as for examining the true vocal cords and vestibular folds from below.