The correct option is A A-III, B-IV, C-II, D-I
The electron transport chain and oxidative phosphorylation during respiration involves five complexes. They are:
(a) Complex I: It involves NADH dehydrogenase
(b) Complex II: It constitutes FADH2
(c) Complex III: Cytochrome bc1 complex forms complex III.
(d) Complex IV: It refers to cytochrome c oxidase complex containing cytochrome a and a3 and two copper centres.
(e) Complex V: It is the ATP synthase involved in oxidative phosphorylation.