【单选题】

Questions 27—30 are based on the passage about sign language. You now have 20 seconds to read Questions 27—30. In which situation would NativeAmericans NOT use sign language according to the passageA．When they wanted to kill an enemy.

B．When they wanted to identify a stranger.
C．When they wanted to tell the time of the day.
D．When they wanted to send a message to a person far away.