Concept:A producer makes its own food from sunlight or non-living materials.Explanation:Producers are green plants that use sunlight to make food by photosynthesis.Maize is a green plant, so it can produce its own food.Goat and man are consumers because they eat other organisms.Bacterium may be a decomposer, not a producer.Therefore, the producer in the food chain is maize.Answer:B. maize