The correct answer is: A. planet’s albedo.
Albedo is the fraction of incident electromagnetic radiation that is reflected by a surface. It is a dimensionless quantity between 0 and 1, where 0 indicates that no light is reflected and 1 indicates that all light is reflected. The albedo of a planet depends on its surface properties, such as the type of surface material, the roughness of the surface, and the presence of clouds.
The Earth’s albedo is about 0.31, which means that about 31% of the sunlight that hits the Earth is reflected back into space. The Earth’s albedo is affected by a number of factors, including the amount of ice and snow on the planet, the amount of vegetation, and the amount of pollution in the atmosphere.
The Earth’s albedo is important because it helps to regulate the Earth’s temperature. If the Earth’s albedo were too high, the Earth would be too cold. If the Earth’s albedo were too low, the Earth would be too hot.
Option B, earth’s albedo, is incorrect because it is not a complete answer. The correct answer is planet’s albedo, which includes all planets.
Option C, both are similar terms, is incorrect because they are not the same thing. Albedo is a general term that can be used to describe the albedo of any planet, while earth’s albedo is specifically the albedo of the Earth.
Option D, None of the above, is incorrect because the correct answer is A.