In the past, most children who went sledding in the winter snow in Verland used wooden sleds with runners and steering bars. Ten years ago, smooth plastic sleds became popular, they go faster than wooden sleds but are harder to steer and slow. The concern that plastic sleds are more dangerous is clearly borne out by the fact that the number of children injured while sledding was much higher last winter than it was ten years ago. Which of the following, if true in Verland, most seriously undermine the force of the evidence cited? B. Very few children wear any kind of protecive gear, such as helmets, while sledding. C. Plastic sled can be used in a much wider variety of snow conditions than wooden sleds can. 请问啦一个选项正确呢？因为好像有争议....谢谢！！！ | 
