SECTIONS OF THE ORAL . CAVITY cavitas oris propria vestibulum oris rima oris fauces

The correct answer is: fauces.<br /><br />The fauces are the opening at the back of the oral cavity, leading into the pharynx. It is the passage through which food and air pass from the mouth to the throat. The other options, cavitas oris propria, vestibulum oris, and rima oris, are also parts of the oral cavity but do not represent the section that leads into the pharynx.