Technician A says that sulfur dioxide emissions from diesel engines are much less of a problem today than they were back in 2006. Technician B says that diesel-sourced particulate matter (PM) smaller than the eye can see is capable of causing respiratory problems in humans. Who is correct?

A. Technician A only
B. Technician B only
C. Both A and B
D. Neither A nor B


Answer: C

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