I think the answer is B. physical activity during pregnancy may increase the likelihood of postpartum depression
I believe that, sadly, the answer is true.
Answer:could face legal action and servers could lose confidence
Explanation:
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!