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) ATP production would increase, because this would spontaneously establish a stronger proton gradient.
B) ATP production would not change, because protons cross the outer mitochondrial membrane to produce ATP.
C) ATP production would decrease, because protons would not be able to move across the inner mitochondrial membrane.
D) ATP production would decrease, because electrons would not move through the electron transport chain and reduce oxygen.
E) ATP production would increase, because this would make more oxygen available in the mitochondrial matrix.