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.

If the climate in an area changed over time to become very cold, which change would most likely help a species living there to survive?
(A) a thicker neck and longer tail (B) a larger mouth and stronger jaws (C) an increase in fur and fat (D) an increase in height and speed
C