In an exothermic reaction, energy is released into the surroundings, which causes an increase in temperature. Thus, the correct answer is option C: The temperature increases. This phenomenon is commonly observed in reactions like combustion, where heat is felt as warmth from the reaction process.
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In an exothermic reaction, energy is released to the surroundings, causing an increase in temperature. This results from the heat generated during the reaction. Therefore, the correct answer is C: The temperature increases. ;