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How is the residual magnetism from material removed?

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How is the residual magnetism from material removed?

(a) Retentivity

(b) Coercivity

(c) Magneton

(d) Switching off the magnetic field

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The question is from Classification of Magnetic Materials in section Magnetic Properties of Materials of Engineering Physics II

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Correct option is (b) Coercivity

To elaborate: The residual magnetism can be completely removed from the material by applying a reverse magnetic field. Hence coercivity of magnetic material is the strength of the reverse magnetic field which is used to completely demagnetise the material.

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