Loss of water by absorption of heat causing the transition of its liquid state into gaseous state is known as evaporation of water. Absorption of heat energy by water lowers the temperature of surface thereby causing cooling effect. It does not involve oxygen.
Photosynthesis is the process of fixation of atmospheric carbon dioxide into complex organic compounds in presence of sunlight. The organisms that use light as source of energy and carbon dioxide as chief carbon source are referred to as photoautotrophic organisms. For example, green plants. These photoautotrophs use water as electron donor during photophosphorylation that results in production of oxygen thereby adding oxygen to the atmosphere.
Aerobic microorganisms use oxygen to carry out cellular respiration to produce energy from complex organic matters. This process consume, rather than producing, oxygen.
Similarly, aerobic decomposers use oxygen to oxidize the complex organic matter present in dead and decaying matter.
Therefore, the correct answer is option B.