The Space Between the Cell Membrane and the Cell Wall

The space between the cell membrane and the cell wall is important during aerobic respiration. Why?

A) Hydrogen ions are transported out into the space to set up a hydrogen gradient.
B) Cytochrome electron carriers are located in the space.
C) Oxygen combines with electrons in that space to form water.
D) Pyruvate is transported into the space to be converted into acetyl coenzyme A to enter the Krebs cycle.