The anxious parent was vigilant over the injured child in spite of a full array of emergency room of doctors and nurses.

【正确答案】 C

【答案解析】解析：尽管急诊室里都是医生和护士，但是这对焦急的父母依然十分关注受伤的孩子。vigilant“警惕的，关注的”。preoccupied“全神贯注的”，unwary“粗心的”，watchful“关心的”，dozing“打盹的”，C选项与划线单词含义相近。