Which of the following is a producer?

A a crow that consumes a dead animal on the side of the road

B a fish that eat smaller fish for its food

C agiraffe that eats the leaves of the trees

D a plant that has insect larva feeding on its roots

D a plant that has insect larva feeding on its roots

A producer is an organism that produces its own energy (complex molecules from simple molecules) via photosynthesis or chemosynthesis.

D, the rest of the options are all consumers that eat producers. Plants are producers since they photosynthesise to transfer their energy, they do not require eating anything therefore they are producers. The consumers eat plants to get their energy (energy is transferred from the producer to the consumer).