The albedo refers to the measurement of reflectivity. It is the amount of the reflection getting diffused of the solar radiation out of the entire solar radiation getting by an astronomical body, like a planet Earth. It is determined on a scale from 0 to 1 and is dimensionless.
Of the mentioned options, the formation of fresh snow on the top ground covering demonstrates the greatest reflectivity, thus, the albedo measurement would be the greatest here.
