You gotta give the paragraph or sentences that will help me elaborate the answer (:
D, with the most simple. When writing speeches/voicing speeches, always go from simple to complex so your listeners or readers can follow the point you are trying to get across.
Hereś something I wrote a few days ago. It meets the requirements, but might not be what you expected. If youŕe not satisfied with it, feel free to report this answer.
Answer:
I think it is D since D fits in to the sentence the best :)
Explanation: