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.

Input: Consider Input: Which of these warms most of the air, water, and land on Earth?  
 (A) Coal (B) Electricity (C) Sunlight (D) Wind

Output: C


Input: Consider Input: The basic life functions of an organism are carried on by  
 (A) cells (B) nutrients (C) atoms (D) hormones

Output: A


Input: Consider Input: Heart cells have fibers that slide up and down and cause contractions. Which types of specialized cells can contract?  
 (A) bone cells (B) nerve cells (C) muscle cells (D) white blood cells


Output: C