Is Methane (CH₄)undergoing Oxidation or Reduction During This Reaction, and How

Is methane (CH₄) undergoing oxidation or reduction during this reaction, and how can you tell? CH₄ + 2 O₂ → CO₂ + 2 H₂O

A) Methane is oxidized because there is an increase in oxygen and a decrease in hydrogen.
B) Methane is reduced because there is an increase in oxygen and a decrease in hydrogen.
C) Methane is oxidized because it becomes a gas.
D) Methane is reduced because water is formed.
E) Methane is reduced because carbon becomes a gas.