A 51-year-old Black man is scheduled to undergo a colonoscopy. Which of the following is correct about the procedure?

Choice A reason: Adequate bowel cleansing is essential for visualization; skipping prep would compromise diagnostic accuracy. Choice B reason: Clear liquid diet is recommended, but it should begin the entire day before the procedure, not only after midnight. Choice C reason: This is correct. The left lateral decubitus position with knees flexed is standard for colonoscopy to facilitate scope insertion and patient comfort. Choice D reason: While NPO status is required for sedation, the primary requirement is bowel prep; 6 hours alone is insufficient for procedure safety and visualization.