E Four people were killed and more than fifty injured when fans rushed to get into a stadium in Chicago yesterday where a British pop group was giving its last concert in the city. The incident occurred when the gate were opened to admit a huge crowd of young people waiting outside the stadium for the sale of unreserved seat tickets. People were knocked over in the rush. The injured were sent to the hospital immediately. But three, including a fourteen-year-old high school student, died on the way and one died this morning. Twenty have already left the hospital after regular medical check-up and treatment. Six are still under emergency treatment. The pop group was unaware of what has happened and the concert later went ahead as planned. A police spokesman said that the police had decided to allow the concert to proceed in order to avoid further trouble, but they insisted the organizers of the concert be responsible for the incident. Roger Bodman, CNN, from Chicago. What might NOT be one of the causes of the incident
A．Young people’s enthusiasm over the British pop group. B．The decision to open the gates to sell the unreserved seat tickets. C．The pop group was to leave after the concert. D．The stadium was too small to hold such a big crowd of audienc