In the Electron Transport Chain,what Occurs Between the Two Membranes

In the electron transport chain,what occurs between the two membranes of mitochondria?

A) Glycolysis occurs in the membranes.
B) Protons are pumped into the space between the membranes.
C) Oxygen is transported across the membranes.
D) The membranes prevent the mitochondria from rupturing during osmosis without two membranes.
E) The Krebs cycle enzymes are found on the outer mitochondrial membrane.