In a test tube containing a salt, a few drops of dilute H2SO4 was added, which gave colourless vapours having the smell of vinegar. The vapours turned the blue litmus paper red. Identify the correct anion from the following :

1. A. Carbonate, CO3 2-
2. B. Sulphide, S 2-
3. C. Acetate, CH3COO-
4. D. Sulphate, SO4 2-

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