Which of these is an autotroph?

consumer

producer

carnivore

herbivore

Consumer

These are heterotrophs because they can not prepare their own food but obtain from other organisms, i. e. man.

Producer

These are autotrophs which can prepare their own food in the presence of sunlight i. e. plants.

Carnivore

These are heterotrophs which eat meat of other organisms and can not prepare their own food, i. e. lion.

Herbivore

These are heterotrophs which eat grasses, i. e. rabbit.

Conclusion

The correct option is producer.

Producers are plants which are autotrophic