Final answer:
Technician A is inaccurate as the PCV system indirectly helps with emissions control, but is not primarily designed to limit CO emissions. Technician B is correct that catalytic converters reduce HC emissions at the tailpipe.
Step-by-step explanation:
The question asks about the effectiveness of two automotive technologies in reducing vehicle emissions. Technician A claims that the PCV system (Positive Crankcase Ventilation system) is designed to limit CO (carbon monoxide) emissions. While the PCV system does help reduce the release of some emissions by re-routing crankcase vapors into the engine to be burned off, its primary function is not the direct reduction of CO emissions, which would be more effectively controlled by other means such as the catalytic converter.
Technician B states that catalytic converters reduce HC (hydrocarbon) emissions at the tailpipe. Catalytic converters are designed to convert harmful emissions, including hydrocarbons, carbon monoxide, and nitrogen oxides (NOx), into less harmful substances like carbon dioxide (CO2) and water vapor (H2O), before they are released into the atmosphere. Thus, they play a crucial role in reducing the level of HC emissions from vehicles.
Therefore, in this scenario, Technician B is correct about catalytic converters reducing HC emissions. As for reducing CO emissions specifically, both the PCV system and the catalytic converter contribute to overall emission controls, but the claim that the PCV system is designed primarily to limit CO emissions may not be fully accurate.