问题详情

What was his first reflection when he stood at the corner？
A．There was a terrible accident in which an airliner struck the first building.
B．A terrorist attack against America had begun.
C．People were floating down from the top of the building as if they wanted to break a world record.
D．He was just at a loss and could not make out what had happened.请帮忙给出正确答案和分析，谢谢！