Multiple Choice Question (MCQ)
Question: Which is harm full emission element produced by an internal combustion engine?
A.
Co<sub>2</sub> + Hc + H<sub>2</sub>O
B.
H<sub>2</sub>0 + CO<sub>2</sub> + Nitrogen
C.
CO + HC + NOx
D.
Pb + CO<sub>2</sub> + Nox
Correct Answer: CO + HC + NOx