Answer:
Mitochondria.
Explanation:
Mitochondria is a semi-autonomous organelle that contains their own genetic material. The electron transport chain occurs inside the mitochondria and results in the formation of ATP.
Cyanide is a chemical that acts as the inhibitor of electron transport chain and result in decrease production of ATP. Cyanide binds with Complex IV of electron transport chain present inside the inner mitochondrial membrane.
Thus, the answer is option (a).