I believe it's the last one "<span>Scientists studied the trapping of gases in the atmosphere."</span>
The correct sentence should be, "Have you read A Good Scent From A Strange Mountain (The book title should be either underlined or italicized. I prefer italicize though) by Robert Olen Butler?
The correct answer would be option D, since it is the one that correctly uses "-". Hope I was able to help, if you need any more help, please let me know so I can further assist you.
D. Develop and argument for each decision you made
Footnotes usually appear at the bottom of a paper.
