In the following questions, four alternatives are given for the Idiom/phrase printed in Bracket in the sentence. Choose the alternative which best expresses the meaning of the Idiom/phrase.Question: The police (cordoned off) the area after the explosion.

• A. The police filled the whole area
• B. The police isolated the area
• C. The Police checked everyone in the area.
• D. The police did not allow anyone to leave the area