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Using limestone in steel production primarily serves the purpose of aiding in the removal of impurities from molten steel. During the steelmaking process, limestone acts as a flux. This means it helps to combine with impurities such as silica and phosphorus, which are present in the iron ore and can negatively affect the quality of the steel. When these impurities bind with the limestone, they form a slag that can be easily removed from the molten steel. This process is crucial because the presence of these unwanted elements can lead to defects in the final steel product and compromise its mechanical properties.

While other options might suggest potential benefits of limestone in steel production, they do not accurately represent its primary function. The aspects related to strength, oxidation, and aesthetics are not the main advantages of limestone's role in the steelmaking process, making the correct choice focused on impurity removal. This contributes significantly to producing high-quality steel with the desired properties for various applications.