[单项选择] Questions 14 to 17 are based on the following passage.
At the end of the passage, you will be given 20 seconds to answer the
questions. Now listen to the passage.
Why is the usual reason of flag burning according to the passage A. Some people do so to voice their position to a special issue. B. Some people do so to test the impatience of the public. C. Some people do so to express their hatred of the country. D. Some people do so to express their political opinion.