Purposeful delivery means that an author designed the story and the method of delivering it with a particular audience in mind. This usually means that the author was able to design a message that particularly appeals to a certain type of reader. Moreover, this results in the author being more likely to fulfill his purpose in writing the text.
Bellboy: yes sir the lower part of the hotel is about gone, sir. would most likely be the answer because he says it in a way that sounds almost as though it is not a big deal while in reality it is. I hope this helps!