Correct sequence in electron acceptors in ATP synthesis is

The correct option is B Cyt b, c, a, $a_3$
Cytochromes are the electron moves in the different electron transport complexes in the membrane of the mitochondria which helps in the formation of ATP by the process of oxidative phosphorylation. The sequence of the movement of the electrons includes cytochromes b, cytochrome c, cytochrome a, and cytochrome a${}_3$.

So the correct option is 'Cyt b, c, a, a${}_3$.'