单选题
Undocumented workers became the target of "Operation Safe Travel" because ______.
A、
evidence was found that they were potential terrorists
B、
most of them worked at airports under threat of terrorist attacks
C、
terrorists might take advantage of their illegal status
D、
they were reportedly helping hide terrorists around the airport
【正确答案】
C
【答案解析】
要点理解题。第二段概要介绍了“安全出行行动”。其中最后一句Authorities said the undocumented workers illegal status made them open to blackmail by terrorists．即是官方原因。
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