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:
The correct answer is B terpentation
Explanation:
Trepanation consisted on drilling a hole on a person's skull to relieve the pressure of blood after an injury and treat intercranial diseases. It is presumed this surgery exists from the Neolithic Age and has been done first by Egyptians, Greeks, Romans and Indians.
The correct answer is iodine
Because bipolar disorder and dementia are gained illnesses (usually at a later age), while anxiety and depression can happen to anyone from past experiences or just stress.