They give the piece a dreary, melancholy tone.
The imagery of these quotes are very dark and gloomy. They change the author's tone into a more dreary, melancholy tone.
Garrison cared about his image above all else
I believe it to be third person.
I would say the correct answer is that has an undetermined answer.If a subject has been thoroughly covered, then there is no need for this researcher to do it all over again. If it's impossible to answer, there is no need to try. If it can be answered easily, then it doesn't really require a research. This leaves us with the last option, because a researcher might want to try and determine the answer.
