Ill answer them bro what you need help with.
Answer:
Letter D demonstrates parallel structure.
Explanation:
Last one (d) the others dont even make sense
Try starting with a simple outline to organize your thoughts so you don't get confused it may be easier to actually write the body paragraphs before any introduction or conclusion so you can correspond your thoughts in your body paragraphs with your introduction and conclusion but it depends on who you are and what you prefer