The correct answer would be D!
A is infinitive (to sneeze)
B is conditional (could change)
C is indicative (prefers)
D is imperative (cover)
To write an effective ending to your essay, you should B. END ON A NOTE THAT'S LIKELY TO STICK IN THE READER'S MIND.
This is to ensure that your essay will still occupy the minds of your readers even after reading it.
Events or thoughts that readers can relate to your essay's end note will also bring back the ideas or thoughts you have stated in your essay.
I’m not really sure how to help with research, but if you’re struggling with the presentation itself you should use slidescarnival.com They have preorganized slideshows that don’t take much effort to look like you spent a super long time on them.