Questions 11 to 13are based an the following passage. At the end of the passage, you will be given 15 seconds to answer the questions. Now listen to the passage. ______ killed the three chickens. Now listen to the conversation.

A．because the bird couldn’ t repeat his master’s name
B．because the bird screamed all day long
C．because the bird uttered the wrong word
D．because the bird failed to say the name of the town

A．an instrument
B．a city
C．a theater
D．a concert