无主语句的翻译处理 — 英语词汇题

汉译英时，处理无主句「应该采取有效措施防止空气污染」最恰当的译法是（　）。A. Effective measures should be taken to prevent air pollution.　B. Should take effective measures to prevent air pollution.　C. Effective measures will take to prevent air pollution.　D. It should take effective measures to prevent air pollution.