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: Living things are classified as producers or consumers according to  
 (A) their speed of movement (B) the size of their communities (C) how they obtain food (D) how they reproduce
Example Output: C

Example Input: Which is the best evidence for the theory of continental drift?  
 (A) the appearance of volcanoes at the boundaries where plates collide (B) earthquakes at boundaries where one plate slides past another (C) cases where a species exists in only one isolated place (D) fossils of the same species found on widely separated continents
Example Output: D

Example Input: Which statement is the best description of the Milky Way galaxy?  
 (A) a collection of gases held together by inertia (B) a group of planets revolving around a single star (C) a collection of stars and gases with the Sun as its center (D) a group of stars, dust, and planets held together by gravity
Example Output:
D