This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: ETC, Subject name: Biochemistry
Arrange the components of ETC used in sequence when ETC stas from FADH2: A. ATP synthase B. Cytochrome c Reductase C. Succinate dehydrogenase D. Cytochrome c oxidase 
Select and explain. 
A. A - D- B- C, B. C - B- D- A, C. C - D- A-B, D. D - B- A- C
B: C - B- D- A
Answer: B: C - B- D- A 
Explanation: Components of Electron Transpo Chain