During heavy physical exercise, a sprinter's leg muscles undergo anaerobic respiration. Select the option that correctly identifies the substance produced in the muscle cells, the location of this pathway inside the cell, and the symptom it triggers.

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• A Ethanol; Mitochondria; High fever
• B Carbon dioxide; Nucleus; Muscle spasms
• C Lactic acid; Cytoplasm; Muscle cramps
• D Pyruvate; Chloroplast; Joint swelling

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