Answer:
The correct answer is - grass.
Step-by-step explanation:
In a food web, different organisms including plants and animals are interrelated in the form of organisms that depend on one other for their food and energy by eating one another.
They producer their own food and initiates the food web that makes them the first trophic level. The animals that depend on plants or eat them are called primary consumers and animals eating primary consumers are called secondary consumers.
In a food web, the largest population is that of producers as they are bais of the complete food web and are able to produce their food and not depend on other organisms. The grass is the producer here.