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: All of the following can become fossils except  
 (A) bones. (B) shells. (C) teeth. (D) rocks.
Example Output: D

Example Input: There is a river at the base of Mount Tom. In the spring the water level is usually very high. In the summer it is lower. The higher level of water during the spring comes from  
 (A) hurricanes. (B) melting snow. (C) tornadoes. (D) evaporating water.
Example Output: B

Example Input: Which combination of letters could be used as a chemical symbol for an element?  
 (A) BR (B) Chl (C) Dy (D) FeO
Example Output:
C