Which of these is not the step involved in extraction of an ore?

Concentration of the ore.

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Electrolysis

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Reduction using carbon

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Corrosion

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Solution

The correct option is D Corrosion
The metals extracted from Earth's crust endure the process of concentration to remove impurities from the ore. Several processes, different for each metal like roasting and reduction are done to get the pure metal from it's combined state like sulphides or oxides. However, corrosion is not a step in the extraction of ore. Hence, Option $D$ is correct.

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2 C u_{2} O + C u_{2} S H e a t - -- \to 6 C u + S O_{2}

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