You conduct an experiment to determine where an inhibitor of the electron transport chain acts. After adding the inhibitor to respiring mitochondria, you analyze several different cofactors of the electron transport chain and find FMN = reduced, Cytochrome bL = oxidized Cytochrome bH = oxidized and Cytochrome a = oxidized. Where did the inhibitor act?
a. At complex I, blocking the transfer of electrons to Q.
b. At complex III, blocking the transfer of electrons to cytochrome c.
c. At complex IV, blocking the transfer of electrons from cytochrome c.
d. At complex IV, blocking the transfer of electrons to oxygen.