Both of theese preamble and constitution are constant. I meen they can't be changed at all
The poets description of trees, beetles,flowers, pastures, and a sunset affects the tone and conveys the central theme of the poem ''Elegy, written in a country churchyard'' by giving the poem a somber and almost reverently sorrowful tone, it goes with the theme of being written in a''country churchyard'' where there is the dead that has been buried and the feelings the poet must have felt while writing this of deep respect for the nature that surrounded him, tells us that the poet must have experienced loss. i hope this answer helped, although it is only an opinion, i reviewed the poem from ''Cliff notes'' have a great day!
D, summary of information. A discovery is not accurate, because this is a research paper, meaning you are researching something that has already happened. B isn't correct, because recommendations are generally only used for persuasive writing. C isn't correct, because a deeper question in the ending wouldn't make sense, as you want to cover everything in the body. D is your correct choice, since you always want to summarize information at the end of a research paper.