问题详情

The United States decided to take measures to ensure the security of its embassies when
A．at least 150 American embassies were found not to meet its security standards.
B．the AP News Agency reported the security standards of its foreign embassies.
C．its embassies in Kenya and Tanzania were assailed 10 years ago.
D．at least 4 billion dollars were found missing in its embassy in Kenya.请帮忙给出正确答案和分析，谢谢！