Answer:
D
Explanation:
Since its its natural protein and fats its on the vegan side which mean it'll be D.
I would have to say the answer is C.
A is incorrect since hydrogen is not an air pollutant.
B is incorrect because ozone is most definitely one of the top.
And D has cyanide which is a chemical for suicide during wars.
Hope this helps!
Answer:
I beleive it would be manager, operator, teacher. so b
Explanation: