broad topic isn't exactly what you want in a presentation, you usually want to have a very narrowed topic, focusing on something specific. Detains and examples are very important, so check that. You always need multiple sources. A cited list is also very important, because it's technically illegal to not have one if you used any info from somewhere else besides your own brain. D isn't important at all E could be important for the working progress phase, but for the presentation itself, it's not really needed.
Answer: The contrast effect is a magnification or diminishment of perception as a result of previous exposure to something of lesser or greater quality, but of the same base characteristics.
