Answer:
Option B
Step-by-step explanation:
The food chain is as follows -
grass -> aphids (small grazing insects) -> ladybugs (carnivorous beetles) -> toads -> snakes
The grass is the primary producer while the snake is the tertiary consumer.
Grass is consumed by grazing insects, which is then consumed by carnivorous beetles. Carnivorous beetles is eaten by toads which is turn is fed upon by snake.
Hence, option B is correct