Instructions: You are given a science question (hard-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.
Input: Which example describes a behavioral adaptation?  
 (A) A bird builds its nest in the ash near a volcano. (B) A whale has the ability to hold its breath for 20 minutes. (C) A fox's hair is white in the winter and brown in the summer. (D) A monkey has long arms that allow it to swing from one branch to another.
Output:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
A