【正确答案】 C

【答案解析】[听力原文]
   At one time Carolyn McCarthy's world focused on the town, where she lived with her husband and son and she was, in her own words an "average person" and "one of the quietest people you've ever met." The incident that changed her life forever took place on the day when a gunman opened fire in a car packed with commuters on their way home from work. By the time the shooting was stopped, six people were fatally wounded—one of them McCarthy's husband. Her son, also in the car was partially paralyzed for life. As McCarthy wrestled with her grief and anger, she swore she would do something to help stop America's plague of gun-related violence. She began talking to anyone who would listen and started working with gun control organizations. In the process, she found herself addressing citizens' groups all across Long Island. As people started listening, she had to adapt her conversational abilities to larger audiences and more formal speaking situations. The spontaneous give-and-take of conversation evolved into structural public speeches. When the U.S. Congressman in McCarthy's district voted to repeal the federal ban on assault weapons, McCarthy took her speech-making to a new level and she announced her candidacy for Congress. Her great challenge came five months later, when she addressed a national television audience in Chicago. Fired by the belief, McCarthy spoke movingly about her journey into politics and about the toll that gun violence takes in American society. Often addressing several audiences a day, she communicated her ideas so effectively that she was elected to the U.S Congress by a comfortable margin.
   What changed McCarthy's life?
录音开头处指出，McCarthy在小镇里过着平静的生活，但是一次事件永远地改变了她的生活。在一辆载着通勤者下班回家的车上发生了一起枪击事件，她的丈夫和儿子都在车上，枪击结束后，她的丈夫受了致命伤，她的儿子终身局部瘫痪，由此可知本题答案为C。