Instructions: You are given a science question (hard-level) and four answer options (associated with "A", "B", "C", "D"). Your task is to find the correct answer based on scientific facts, knowledge, and reasoning. Do not generate anything else apart from one of the following characters: 'A', 'B, 'C', 'D'. There is only one correct answer for each question.
Input: What is the role of decomposers in a food web?
(A) Decomposers use sunlight to make food. (B) Decomposers are a food source for plants. (C) Decomposers break down dead plants and animals. (D) Decomposers only eat plants that grow underground.
Output:
C