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(B) When a ferromagnetic material is heated above its $Curie$ temperature,the thermal energy becomes sufficient to overcome the exchange interaction t

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Ferromagnetic domains become random.

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(B) When a ferromagnetic material is heated above its $Curie$ temperature,the thermal energy becomes sufficient to overcome the exchange interaction that keeps the magnetic moments of atoms aligned within the domains.As a result,the ordered alignment of the magnetic domains is destroyed,and the domains become randomly oriented.Consequently,the material loses its ferromagnetic properties and behaves as a paramagnetic material.Therefore,the correct statement is that the ferromagnetic domains become random.

$A$ ferromagnetic material is heated above its $Curie$ temperature. Which one is a correct statement?

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