Correct Answer - A
The statues and paintings coated with white lead get blackened due to action of `H_(2)S` present in traces in atmosphere. When these are treated with `H_(2)O_(2)`, PbS is oxidised to `PbSO_(4)` which is colourless or white.
`underset("black")(PbS)+4H_(2)O_(2)to underset("white")(PbSO_(4))+4H_(2)O`