Question: To hold batteries in place when the  "door" is missing.

  Options: 
 A. Use scissors or a box cutter to cut a piece of cardboard to hold the batteries in place, then use duct tape to hold down the cardboard on the batteries.
 B. Use scissors or a box cutter to cut a piece of cardboard to hold the batteries in place, then use duct tape to separate the cardboard from the batteries.
Answer: A