Final answer:
The primary purpose of projecting a digital slide show in a classroom setting is to enhance engagement and understanding.
Step-by-step explanation:
The primary purpose of projecting a digital slide show in a classroom setting is to enhance engagement and understanding (B). Digital slide shows can include a combination of text, images, and multimedia elements that can make the content more interesting and interactive for students. They can help to visually reinforce key concepts, provide examples and illustrations, and facilitate discussions and class participation.