The correct option is A Godlewski
C E Godlewski was the scientist who has discovered the atmospheric CO2 concentration to be suboptimal for photosynthesis. Carbon dioxide is good for plants for photosynthesis, they use these gas and make food by own. Plants use the energy in sunlight and to convert CO2 and water to sugar and oxygen. This theory is proved by the Godlewski for plants.
So, the correct answer is 'Godlewski'.