【正确答案】 B

【答案解析】[听力原文]
   According to a report to Congress, more than 4.5 million students endure sexual misconduct by employees at their schools, from inappropriate jokes all the way to forced sex. The best estimate available shows nearly one in ten kids faces misbehavior ranging from unprofessional to criminal sometime between kindergarten and 12th grade. The report, delivered to Congress on Wednesday, is the first to analyze research about sexual misconduct at schools.
   Some educators took issue with the way the report combines sexual abuse with other behaviors, such as inappropriate jokes, in one broad category of sexual misconduct.
   How many students does the report reveal endure sexual misconduct at school?
数字题。问的是报告中显示有多少学生在学校忍受着性侵犯。由画线句可知，人数为4.5 million。故B为正确选项。