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: Which statement describes animal embryos?  
 (A) display all the features of an adult (B) represent the earliest stage of development (C) have the same number of cells as a fertilized egg (D) have half the number of chromosomes as an adult
Example Output: B

Example Input: When iron combines with oxygen in a moist environment, rust forms because of a  
 (A) chemical reaction. (B) physical reaction. (C) change in density. (D) change in temperature.
Example Output: A

Example Input: Mounds and ridges in the Snake Range area of Nevada are composed of boulders, sand, and gravel. These landforms were most likely formed by  
 (A) earthquakes. (B) melting glaciers. (C) wind erosion. (D) hurricanes.
Example Output:
B