The correct option is D Chlorophyll
Autotrophs are living organisms that use sunlight or other external source of energy to power the synthesis of chemical compounds like sugars. Plants are autotrophs and they rely on photosynthesis to make their food.
There is suggestive evidence that photosynthetic organisms were present approximately 3.2 to 3.5 billion years ago. Chlorophylls are essential pigments for all photo tropic organisms. Chorophylls are themselves the product of a long evolutionary development and can possibly be used to help understand the evolution of other aspects of photosynthesis. Chlorophyll is found in virtually all photosynthetic organisms, including green plants, prokaryotic blue green algae and eukaryotic algae.