Concept:Photosynthesis is the process that fixes atmospheric carbon into energy-rich organic compounds.Explanation:During photosynthesis, plants absorb atmospheric carbon dioxide, CO2.This inorganic carbon is reduced to form glucose, C6H12O6.Light energy is trapped and converted into chemical bond energy stored in the glucose molecules.The carbon atoms from the air therefore become part of organic compounds that contain usable energy.Answer:B. photosynthesis