When a Suction Feeder Quickly Opens Its Mouth, Negative Pressure

When a suction feeder quickly opens its mouth, negative pressure results in water and prey rushing into the mouth. Which of the following helps move the prey to the back of their throats and into the pharynx?

A) pharyngeal jaws grabbing onto the food
B) moving water out of the oral cavity over the gills
C) chewing of food trapped through suction by the anterior jaws
D) moving water down through the digestive tract so that it carries the food with the flow of water.