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: A light-year is a measure of  
 (A) time. (B) energy. (C) distance. (D) direction.
Example Output: C

Example Input: Skunks spray a strong-smelling liquid to ___.  
 (A) get rid of wastes (B) attract prey (C) defend themselves (D) help nearby plants grow
Example Output: C

Example Input: An octopus squirts black ink around itself to hide from predators. This adaptation is an example of  
 (A) creating shelter (B) recycling nutrients (C) a transfer of energy (D) a defense mechanism
Example Output:
D