Inhibition of Which of the Following Processes Would Reduce or Eliminate

Multiple Choice

Inhibition of which of the following processes would reduce or eliminate generation of a proton-motive force in mitochondria?

A) the flow of protons through ATP synthase down their concentration gradient
B) the reduction of NAD+ by the first electron carrier in the electron transport chain
C) lowering of pH in the mitochondrial matrix
D) pumping of hydrogen ions from the mitochondrial matrix across the inner membrane and into the intermembrane space