单项选择题

Questions 1 to 5 are based on an interview. At the end of the interview you will be given 10 seconds to answer each of the following five questions. Now listen to the interview. On which of the following occasions should the "no" be used according to Julie

A. When a child is playing with a socket.
B. When a child is using a dime.
C. When a child is climbing on the floor.
D. When a child is playing with a safety pin.