The correct option is B Green plants make their food from organic compounds.
Green plants and blue green algae are called producers as they prepare their own food material. They convert the inorganic compounds like CO2and water into organic compounds through the process of photosynthesis. The producers thus, convert solar energy into chemical energy. Decomposers in any ecosystem feed upon dead and decaying matter and convert the complex organic ompounds into simpler substances and also free the inorganic elements to be used again by plants.