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catalytic converters come in two types: ​ and ​.
o a. reduction; carbonized
o b. oxidizing; reduction
o c. carbonized; optimized
o d. complex; simple

Explanation:

Catalytic converters use chemical reactions to reduce harmful emissions from vehicles. Oxidizing converters help oxidize (react with oxygen) pollutants like carbon monoxide (\(CO\)) and unburned hydrocarbons (\(HC\)). Reduction converters reduce nitrogen oxides (\(NO_x\)) by removing the oxygen from them. These are the two main types based on the chemical reactions (oxidation - reduction) they facilitate to clean up exhaust gases.

Answer:

B. Oxidizing; reduction