which of these is an autotroph?\no consumer\no producer\no carnivore\no herbivore

Answer:

B. producer

Brief Explanations:

Autotrophs are organisms that can produce their own food through processes like photosynthesis. Producers, such as plants and some algae, are autotrophs. Consumers (including carnivores and herbivores) obtain energy by eating other organisms and are not autotrophs.