The Correct Sequence for the Four Reactions of The $\beta$ -Oxidation Pathway in Terms of "Functional Group Acted Upon" Is

The correct sequence for the four reactions of the $\beta$ -oxidation pathway in terms of "functional group acted upon" is

A) alkene, alkane, ketone, 2 $\degree$ alcohol
B) alkane, alkene, 2 $\degree$ alcohol, ketone
C) alkane, ketone, 2 $\degree$ alcohol, alkene
D) ketone, 2 $\degree$ alcohol, alkene, alkane