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${FADH}_2$ is produced by the Krebs cycle. The electron transport chain oxides ${FADH}_2$ and uses the potential energy of the two released electrons to pump protons across the inner membrane to create a proton gradient in mitochondria.

For every ${FADH}_2$ oxidized, how many total protons are pumped across the inner membrane?

A

10

B

8

C

6

D

4

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