In Which of the Following Reactions Is a Carbon Atom $\rightarrow$

In which of the following reactions is a carbon atom not oxidized or reduced?

A) CH₃CH₂Br + OH^- $\rightarrow$ CH₃CH₂OH + Br^-
B) CH₂=CHCH₃ + H₂ $\rightarrow$ CH₃CH₂CH₃
C) CH₃CH₃ + ½O₂(g) $\rightarrow$ CH₃CH₂OH
D) CH₃CH₂CHO + ½O₂(g) $\rightarrow$ CH₃CH₂CO₂H
E) A carbon atom is oxidized or reduced in all of these reactions.