Final answer:
A heterotroph is an organism that must consume other organisms for energy, also known as a consumer. This includes animals, fungi, and many bacteria and protists.
Step-by-step explanation:
The kind of organism that is a heterotroph is C) Consumers. Heterotrophs are organisms that cannot produce their own food and instead obtain energy by consuming other organisms. This includes all animals, fungi, and many protists and bacteria. They are often called consumers because they consume other organisms to get the energy they need to survive. Heterotrophs can further be classified based on their diets as herbivores, carnivores, omnivores, and decomposers.