Correct option is A
A good brick earth composition is critical for producing quality bricks with appropriate strength and durability. The ideal composition of brick earth includes the following:
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Alumina (20% to 30%): Provides plasticity to the soil, enabling easy molding of bricks. Too much alumina can cause the bricks to warp and crack during drying and burning.
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Silica (50% to 60%): Controls shrinkage and provides strength to the bricks. Excess silica can make bricks brittle.
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Oxide of Iron (5% to 6%): Imparts color to the bricks and aids in vitrification during the burning process.
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Lime (up to 5%): Acts as a flux during burning and helps in binding particles together. Excess lime can lead to cracking or disintegration of bricks.
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