For Mitochondria That Are Active in Respiration, Indicate Whether the Movement

Short Answer

For mitochondria that are active in respiration, indicate whether the movement of each of the following molecules into (I) or out of (O) the matrix is thermodynamically favorable. Your answer would be a four-letter string composed of letters I and O only, e.g. IOOI.
( ) O²
( ) H⁺
( ) ADP
( ) CO₂