Respuesta :
Ans.
Producers are autotrophic organisms that use solar energy to convert carbon dioxide into glucose molecules. The carbon present in atmosphere enters to the producers of an ecosystem by the process of photosynthesis, during which carbon dioxide (CO2) is used to make carbohydrates (glucose, C6H12O6).
Thus, the correct answer is option). 'photosynthesis, where the carbon dioxide is turned into glucose.'