Technician a Says the Problem with Using Automobile Catalysts in the Exhaust

Technician A says the problem with using automobile catalysts in the exhaust system of diesel engines is the system's excess air and cool temperatures. Technician B says diesel exhaust catalysts need to be designed to withstand the higher exhaust temperatures of a diesel engine and its exhaust's lower oxygen content. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B