Correct option is A
Gas carburizing has the highest production rate among the carburizing methods. In gas
carburizing, the workpieces are exposed to a carbon-rich gas atmosphere at elevated temperatures, allowing carbon to diffuse into the surface of the metal. This method is highly efficient and widely used in industrial applications because it allows for continuous processing of multiple components, leading to a higher production rate compared to pack, liquid, or solid powder carburizing.
