Answer:
However many possible scenarios of anthropogenic extinction have been proposed; such as human global nuclear annihilation, biological warfare or the release of a pandemic-causing agent, overpopulation, ecological collapse, and climate change.
I strongly believe that it is B. I know it isn't D because it doesn't compare or contrast asthma to something else.
I believe the answer is the third option "Because outside research adds scholarship to my own opinion." Hope this helps. (ﾉ◕ヮ◕)ﾉ*:･ﾟ✧
