Cyanide and Carbon Monoxide Block the Final Step in the Electron

Cyanide and carbon monoxide block the final step in the electron transport chain.What effect would this have on ATP production in the mitochondria?

A) Reduction, because protons would not be able to move across the inner mitochondrial membrane
B) No effect, because protons cross the outer mitochondrial membrane to produce ATP
C) Reduction, because electrons would not be able to move through the electron transport chain
D) Increase, because this would spontaneously establish a proton gradient
E) Increase, because this would make more oxygen available in the mitochondrial matrix