Cytochrome c:

is a haem protein

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accepts an electron from cytochrome coxidase in the mitochondrial electron-transfer chain

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is a non-haem protein

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is irreversibly oxidized in the mitochondrial electron-transfer chain

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Solution

The correct option is A is a haem protein
The cytochrome complex is a small hemeprotein found loosely associated with the inner membrane of the mitochondrion.
It s an essential component of the electron transport chain and transfers an electron from Complexes III (Coenzyme Q – Cyt C reductase) to IV (Cyt C oxidase).

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