Arrange the following steps of the Bayer's process for extracting pure alumina from bauxite ore in the correct sequential order: 1. Digestion of bauxite with concentrated NaOH solution. 2. Filtration of insoluble impurities (red mud). 3. Precipitation of aluminum hydroxide by seeding. 4. Calcination of aluminum hydroxide to obtain pure alumina. Select the correct sequence:

Options:

• A: 2-1-3-4
• B: 1-2-3-4
• C: 1-3-2-4
• D: 4-3-2-1

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