A are the producers called plants and B are the secondary consumers which are called omnivores.

Plants make their own food with the help of sunlight through the process of photosynthesis and hence are called the producers. They are places at first trophic level. Secondary consumers are the organisms that can feed both on plants and animals. They come in between primary consumers (herbivores-the plant feeders) and the tertiary consumers (carnivores-the flesh eaters.)