The right answer is a. synthesis of energy-rich sugars.
With chlorophyll, green plants absorb the light energy needed to synthesize an organic chemical species, glucose C6H1206, from carbon dioxide and water vapor. Each billion tons of the carbon element C are fixed by the green plants in the form of glucose. The reaction, called photosynthesis, also produces dioxygen and helps to regenerate this chemical species necessary for the breathing of living beings.
