Question: Inflate a balloon.

  Options: 
 A. Stretch the opening of the balloon over the outlet of a helium tank, then open the valve on the tank until the balloon is full. Remove the balloon and cut off the opening.
 B. Stretch the opening of the balloon over the outlet of a helium tank, then open the valve on the tank until the balloon is full. Remove the balloon and tie off the opening.
Answer: B