(A) Sulfur Dioxide and Potassium Nitrate
(B)Sulfur and Charcoal
(C) Nitrogen Oxide and Potassium Nitrate
(D) Sulfur Dioxide and Nitrogen Oxide
(A) Sulfur Dioxide and Potassium Nitrate
(B)Sulfur and Charcoal
(C) Nitrogen Oxide and Potassium Nitrate
(D) Sulfur Dioxide and Nitrogen Oxide
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