(a) decomposers

(b) producers

(c) herbivores

(d) carnivores

Correct option – ( b )

Explanation for correct option – producers are those which produce their own food with the help of solar energy , water and carbon di oxide

Explanation for incorrect option – decomposers are organisms which decompose organic material . Herbivores rely on plants and their products for their livelihood . Carnivores eat other organisms .

Hence correct option is producers