Concept:Green plants are called producers because they make their own food using sunlight.Explanation:Green plants contain chlorophyll, which traps sunlight energy.They use water and carbon dioxide to make glucose through photosynthesis.The chemical equation for photosynthesis is:6CO2+6H2O sunlight, chlorophyllC6H12O6+6O2Since they produce their own organic food from inorganic raw materials, they are known as autotrophs or producers.Other organisms are grouped differently: parasites feed on a host, decomposers break down dead matter, and consumers eat other organisms.Therefore, green plants fit the definition of producers.Answer:A. producers.