Remember that this is a question where you have to think in your experiences, powerpoint can help you make more dynamic a presentation or have a more engaging presentation, but you that doesn´t actually help you or guarantees that your presentation will be engaging and be clear, that all depends solely on you or the presentator that is doing the presentation.
The key word in this question is "guarantees". I can speak from experience that using a PowerPoint does not guarantee that the audience will understand everything included or end on schedule. Anyone who has sat through a PowerPoint-driven lecture can tell you that being engaged and excited depends a lot more on content and delivery than the fact that a PowerPoint was used.
While a PowerPoint may help the presentation stay on schedule, be clear and understood, and keep the audience engaged, the mere fact that a PowerPoint was used guarantees none of these. Answer is D
