C. Teacher would be the correct answer
While A and B often work in . a school environment, a teacher is the best option.
~I hope this helps!~
The inhalation of mercury vapor can produce harmful effects on the nervous, digestive and immune systems, lungs and kidneys, and may be fatal. Mild, sub-clinical signs of central nervous system toxicity can be seen in workers exposed to an elemental mercury level in the air of 20 μg/m3 or more for several years.
The answer to this is April 6, 1896
