Which one of the following surfaces has the maximum albedo?

Correct option is A

The correct answer is: (a), Dense cloud
Albedo can be simply defined as how much light that hits a surface is reflected back without being absorbed. When the solar radiation passes through the atmosphere, some amount of it is reflected, scattered and absorbed.
The reflected amount of radiation is called as the albedo of the earth.
The value of albedo will be different for different surfaces.