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 is a trait that a child can inherit from its parents?  
 (A) eye color (B) a broken leg (C) length of hair (D) language skills
Example Output: A

Example Input: What is an environmental threat posed by oil and gas acquisition and transport that is not posed by the acquisition and transport of the energy resources uranium, and wood?  
 (A) habitat change (B) vehicle pollution (C) pipeline leaks (D) soil compaction and loss
Example Output: C

Example Input: Which human body systems work together to send messages?  
 (A) muscular and skeletal (B) nervous and endocrine (C) excretory and digestive (D) circulatory and respiratory
Example Output:
B