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: When a person speaks, the type of wave produced can be described as all these except  
 (A) transverse. (B) mechanical. (C) compression. (D) longitudinal.
Example Output: A

Example Input: The Sun is classified as  
 (A) an organism (B) a decomposer (C) a star (D) a planet
Example Output: C

Example Input: Charles Darwin made a number of observations and inferences during his travels. He studied island finches during a long period of time. Which statement is an inference?  
 (A) Individual birds have different colored feathers. (B) Island finches have a large number of offspring. (C) Individual birds of an island finch species have many differences. (D) Island finches share a common ancestry with mainland finch species.
Example Output:
D