I think is D Carbon dioxide
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Answer:
Mitochondria is the organelle where cellular respiration takes place. Cellular respiration can be described as a process in which oxygen and glucose are converted into carbon dioxide and water along with the release of ATP. This reaction can be written as:
Glucose + Oxygen → Carbon dioxide + Water + ATP molecules
C6H12O6 + 6O2→ 6CO2 + 6H2O + ATP
The ATP made can be broken down so that energy is released.
ATP + H2O → ADP + Pi + free energy
During when we are alive, oxygen is used to make atp, and atp is used to break cross-brdiges when we are relaxing / contracting our muscles. when a person is dead then there is no oxygen but the body can still produce atp via anaerobic glycolysis, when the glycogen is depleted then no atp is produce so the the cross bridges can no logner be broken that is why skeletal muscles lock