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Answer:
This is a double displacement reaction because two compounds (KNO3 and S) are reacting to form two new compounds (K2S and N2). The nitrate ion (NO3-) is being reduced to nitrogen gas (N2), while the potassium ion (K+) is being oxidized to potassium sulfide (K2S). Carbon is also involved in the reaction, but it does not participate in the redox process.