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 of the following is an example of a physical change?  
 (A) lighting a match (B) breaking a glass (C) burning of gasoline (D) rusting of iron
Output:
B