I think it could be letter B
Soil is made out of all of these things and covers almost all landmasses. Even below sand and rock there is soil.
I believe the answer is D
There are two types of fermentation aerobic and anaerobic. Aerobic are those that need oxygen to ferment while anaerobic are those who do not need oxygen. Products of fermentation are usually water, ethanol, lactic acid and carbon dioxide. Other products are acetone and butyric acid.