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: If the solar system were used as a model of an atom, what would the Sun most likely represent?  
 (A) an ion (B) a nucleus (C) a neutron (D) an electron

Output: B


Input: Consider Input: Which form of energy are x rays and ultraviolet light?  
 (A) nuclear (B) heat (C) electromagnetic (D) chemical

Output: C


Input: Consider Input: Some processes that shape Earth's surface are slow. Other processes are rapid. Which statement describes a rapid change?  
 (A) Glaciers melt and form rivers. (B) Wind weathers rocks into sand. (C) Earthquakes move land and rocks. (D) Rivers carry sediment and build deltas.


Output: C