I didn't read the text that goes along with this but based on the information, I would say the answer is D. I hope this helps!
Answer:
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Explanation:
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Have you ever watched a dull movie? Have you been bored watching the teacher present slides? Well imagine the teacher presenting every single slide, and each slide has over 1000+ words. Yeah, you would be bored. This is why using the main idea in a presentation is needed; it prevents long slides that could take hours to finish, but it shortens the slide to a point where it can be easily understood without unnecessary detail.