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Correct Answer: C. Coke
Explanation: The chief source of sulphur in the production of pig iron within a blast furnace is coke. Although coal undergoes a coking process that removes about 40% of its initial sulphur, the resulting coke still contains approximately 0.5% sulphur, making it the primary contributor of this impurity. In contrast, iron ore (such as haematite) typically contains only a minor amount of sulphur, around 0.01%, while other raw materials like limestone and dolomite are used as fluxes rather than serving as significant sulphur sources. Controlling sulphur is critical in steelmaking because high levels lead to hot shortness, which causes the metal to become brittle and crack when worked at elevated temperatures.

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