Hello! I don’t think this is truly a question however I hope you have a good day!
This is punctuated correctly.
"Marshmallows are my favorite snack" is a complete sentence unto itself.
The comma instead of a period shows that the sentence spoken is part of the whole sentence, which includes the speaker (she) and a word to describe how the speaker said it (explained).
The correct answer for the question that is being presented above is this one: "E. <span>Neanderthals had projecting brow ridges." </span><span>While the structure of the head and face were not very far removed from those of modern humans, there were still quite noticeable differences. Notably the modern human head is shorter, with a less pronounced facial front.</span>
There is a radical error, I think, in the usual mode of constructing a story.
The one ingredient that helps, but is not necessary to an effective speech delivery, is that it is the result of the speaker's natural talent and gift.
With proper preparation and a healthy dose of courage, anyone can be an effective public speaker. The important elements are that message delivery is impactful, the speech is influential towards the audience, and that audience expectations are met or exceeded. Natural talent helps, but thorough preparation and careful speech planning go much farther towards an effective speech.
