Which of the following correctly indicates the number of protons pumped into the intermembrane space at each complex of electron transport for each FADH₂ that is oxidized by the electron transport pathway?

Question

Which of the following correctly indicates the number of protons pumped into the intermembrane space at each complex of electron transport for each FADH2 that is oxidized by the electron transport pathway?

Which of the following correctly indicates the number of protons pumped into the intermembrane space at each complex of electron transport for each FADH₂ that is oxidized by the electron transport pathway?