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.

Input: Consider Input: Kim lost her hammer outside. When she found it a few months later, some parts of the metal were covered with flaky, brown rust. Which type of change occurred when rust formed on the hammer?  
 (A) chemical (B) electrical (C) thermal (D) physical

Output: A


Input: Consider Input: What is the MAJOR reason Earth has seasons?  
 (A) Earth has a moon (B) Earth has a tilted axis (C) Earth has a magnetic field (D) Earth has an elliptical orbit

Output: B


Input: Consider Input: The surface of Earth is constantly changing. Which of these findings provides the best evidence that the crustal surface of Earth has changed over time?  
 (A) Some rock layers are very thick. (B) Some species have become extinct. (C) Marine fossils are found in mountain areas. (D) Igneous rock is found on all tectonic plates.


Output: C