The correct answer is D. Photosynthesis.
Photosynthesis is the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy in the form of sugar. This process does not evolve CO2 in air.
Burning is a chemical reaction that occurs when a fuel combines with oxygen to produce heat and light. This process does evolve CO2 in air.
Breathing is the process by which humans and other animals take in oxygen and release carbon dioxide. This process does evolve CO2 in air.
Organic delay is a term used to describe the process by which organic matter decomposes. This process does not evolve CO2 in air.