On and around earth, all of the following reflect incoming sunlight, except?

a) desert sands

b) polar ice sheets

c) heavy cloud cover

d) atmospheric carbon dioxide

D. Atmospheric carbon dioxide.

Explanation:

Atmospheric carbon dioxide present in the atmosphere in high amounts due to human activities like burning of fossil fuels, deforestation, forest fire. Volcanic eruption, a natural hazard can lead to liberation of carbon dioxide into the atmosphere.

The carbon dioxide gas in the atmosphere has a diatomic structure which absorbs the heat energy from sun instead of reflecting the sunlight. Hence, is responsible for raising the temperature worldwide causing global warming.

the correct answer would be 6 feet.