Pick up the correct statement from the following

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Pick up the correct statement from the following:

A. Blisters in the finished wrought iron, are caused due to the reaction between oxide of iron and carbon

B. The edges of a finished wrought iron are rough due to red shortage

C. Pig iron (charcoal) is manufactured from magnetic ore (Fe₃O₄)

D. All the above

Answer: Option D

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