Question: How do you clean a dishwasher?

  Options: 
 A. Start with an full dishwasher. Place a cup of white vinegar in a dishwasher-safe container on the upper rack of the machine. Run the dishwasher through a hot-water cycle.
 B. Start with an empty dishwasher. Place a cup of white vinegar in a dishwasher-safe container on the upper rack of the machine. Run the dishwasher through a hot-water cycle.
Answer: B