Assertion: The marble structure reacts with traces of `H_(2)SO_(4)` present in acid rain.
Reason: Taj Mahal is being slowly damaged by acid rain.
A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
B. If both assertion and reason are true and the reason is not the correct explanation of the assertion.
C. If assertion is true but reason is false.
D. If assertion is false but reason is true.