Which set of gasses poses the most significant hazards on a farm?
A) b. Methane, carbon tetrachloride, nitrogen dioxide
B) d. Nitrogen dioxide, ethane, carbon tetrachloride
C) a. Carbon monoxide, methane, ethane, nitric oxide
D) c. Nitric oxide, carbon monoxide, nitrogen dioxide
Answer: D) c. Nitric oxide, carbon monoxide, nitrogen dioxide