B, because it's not an advantage for something to be expensive and time consuming
They probably chose this over black since black absorbs he most heat, and if something like a power outage occurs during the hot summer, ya want to stay as cool as possible...this is just my idea.
Green plants and trees use photosynthesis to make food from sunlight, carbon dioxide and water in the atmosphere: It is their primary source of energy. The importance of photosynthesis in our life is the oxygen it produces. Without photosynthesis there would be little to no oxygen on the planet.
