The following text is for questions number 11 to 13 Sunset When the air is clear, the sunset will appear yellow, because the light from the sun has passed a long distance through air and the blue light has been scattered away. If the air is polluted with small particles, natural or otherwise, the sunset will be redder. Sunsets over the sea may also be orange, due to salt particles in the air. The sky around the sun is seen reddened, as well as the light coming directly from the sun. This is because all light is scattered relatively well through small angles, but blue light is then more likely to be scattered twice over the greater distances, leaving the yellow, red and orange colors. 11. As it is pointed out in the passage, the color of the sunset is.... a may be lighter than expected due to salt particles in the air b. red if the sky is clear c. owing its blueness to the distance between the sun and the earth d. a combination of all the colors e depending on the weather conditions and the location where it takes place​