Given below are two statements: One is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : The air around Taj Mahal contains high level of sulphur and Nitrogen oxides. As a result the monument is getting discoloured and getting lustre less

Assertion (B) : Large number of hotels and parking areas use poor quality of fuel which on burning produce oxides resulting in acid rain, which when reacts with marble cause damage to the wonderful monument.

In the light of the above statements, choose the most appropriate answer from the options given below :