You are given a science question (easy-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.

Example Input: Which of the following best describes a role of mushrooms in ecosystems?  
 (A) capturing energy from sunlight (B) consuming living plant material (C) taking energy from animal hosts (D) breaking down dead plant material
Example Output: D

Example Input: One substance found on Earth is more stable as an elemental gas than as part of a solid compound. As a result, this substance is very abundant in the atmosphere. Which substance exhibits these traits?  
 (A) argon (B) chlorine (C) nitrogen (D) oxygen
Example Output: C

Example Input: Which of the following best describes a scientific inference?     
 (A) the data collected during an experiment (B) an explanation based on facts but is not the direct observation (C) an opinion that is not based on logical thinking or material evidence (D) the results from experiments that can be reproduced through more experimentation
Example Output:
B