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.

[EX Q]: The moon goes through phases as it revolves around Earth. During which phase of the moon would it be possible for a solar eclipse to occur?  
 (A) new moon (B) full moon (C) waning (D) waxing
[EX A]: A

[EX Q]: Which could be a possible way to prevent wildlife species from becoming endangered?  
 (A) drinking less water (B) establishing more habitats (C) cutting down more forests (D) stopping underground coal mining
[EX A]: B

[EX Q]: What is the major source of energy for food chains?  
 (A) water (B) air (C) sunlight (D) grass
[EX A]:
C