阅读下面短文，从短文后所给各题的A、B、C、D四个选项中选出能填入相应空白处的最佳选项。
It was 4 o’clock in the morning, when I received the phone call.
“This is the emergency room calling and your son was just 1 in with severe burns on his face, neck and arms. We’ve called for a (n) 2 and are going to fly him to the burn unit in Seattle.”
Seattle was 350 miles from his college, so we knew immediately this was 3 .
