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: Research in which of these areas has the greatest impact on the environment?  
 (A) irradiating food (B) organic fertilizers (C) bacteria to clean up oil spills (D) developing larger, sweeter strawberries
Example Output: C

Example Input: What season is the Northern Hemisphere experiencing when it is tilted away from the Sun?  
 (A) spring (B) summer (C) autumn (D) winter
Example Output: D

Example Input: Water causes weathering when it  
 (A) melts rock. (B) forms deltas. (C) erodes rock in its path. (D) moves rock along a fault.
Example Output:
C