The headline helps develop the ideas in this article because D) It introduces the main topic of the article
Explanation:
The lines "Edison Marvels at the Magic of Electricity" only present the topic of the article since they are not giving any kind of specific information. These words don't show any kind of extra information, opinion, result, intention or objective. This headline lacks a second part so it could present something more than just the topic. However, what the topic is about is clearly presented.
