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: The phases of the Moon are daily changes in the appearance of the Moon. One reason Moon phases occur is because the Moon reflects sunlight. Which is another reason that the phases of the Moon occur?  
 (A) Earth is tilted on the axis. (B) The Moon rises and sets. (C) The Moon orbits Earth. (D) Earth orbits the Sun.
Example Output: C

Example Input: Which of the following best describes an advantage of using a mass production manufacturing system instead of a custom manufacturing system?  
 (A) Customers can provide specific feedback to workers. (B) Workers become skilled in all aspects of assembly. (C) Goods can be easily modified for customers. (D) Products can be made at a lower cost.
Example Output: D

Example Input: Canadian physician Sir William Osler once said, "In Science the credit goes to the man who convinces the world, not to the man to whom the idea first occurred." How does this quote apply to scientific knowledge?  
 (A) Famous scientists have the best ideas. (B) Ideas must be communicated to the public (C) In order to be important, ideas must be believable. (D) The results are less important than the ideas in an experiment.
Example Output:
B