Yes you did it correctly. When quoting a sentence it needs to be put in quotation marks to show that those are not your words but somebody else's.
Hope this helps!!
Diversity can negatively affect a group by the different opinions leading to arguments about who is correct and who is wrong but diversity can positively affect a group because when people are different we see their differences as in opinions or future or background and we can learn from that.
I believe the correct answer is B. end on a note that's likely to stick in the reader's mind.
If you want your essay to stick out from a bunch of other similar essays, you need to have a good 'punchline.' There has to be something in your conclusion which will make your readers remember the essay if you want to differ from a sea of other writers.
