The Catalyst in the Catalytic Converter Accelerates the Rate of the Reaction

The catalyst in the catalytic converter accelerates the rate of the reaction C≡O + O=O $\rightarrow$ O=C=O + O. How does it accomplish this?

A) It mixes carbon monoxide and oxygen.
B) It creates a turbulent mixing of carbon monoxide and oxygen.
C) It raises the temperature of the carbon monoxide and oxygen.
D) It lowers the energy barrier between the carbon monoxide/oxygen reactants and the carbon dioxide/oxygen products.