A honeycomb-shape casing of the metals platinum (Pt), rhodium (Rh), and palladium (Pd) in catalytic converters of automobiles cause more reactions to take place that produce less harmful gases without being affected by the reaction. These metals are catalysts because: A.)They help produce less harmful gasses.

B.)They are metals.

C.)They cause the reactions without being affected.

D.)They are formed into a honeycomb shape