The correct answer is c) heterotrophs.
Heterotrophs are organisms that cannot synthesize their own food and, instead, rely on consuming other organisms or organic substances for energy. This distinguishes them from autotrophs, which can create their own food through processes like photosynthesis or chemosynthesis. Examples of heterotrophs include animals, fungi, and many bacteria, all of which play critical roles in the ecosystem by breaking down organic material and recycling nutrients.