In the commercial manufacturing of glass, 'cullet' (crushed recycled glass) is added to the raw material batch. What is the primary chemical/physical reason for this addition?

Options:

• A: To increase the refractive index and clarity of the final glass product.
• B: To act as a flux that lowers the melting temperature of the batch, thereby reducing energy consumption.
• C: To prevent the formation of air bubbles by increasing the viscosity of the molten glass.
• D: To chemically neutralize the acidic oxides present in the silica sand.

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