Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A): Motor vehicles equipped with catalytic converters should use lead-free petrol.
Reason (R) : Lead in the petrol inactivates the expensive metals namely platinum-palladium and rhodium that act as catalysts.
In the light of the above statements, choose the most appropriate answer from the option given below.