Question: How can you get rid of dust mites in pillows and bedding?

  Options: 
 A. Airing out bedding is even more effective than washing when it comes to killing dust mites, reducing 95.1 percent of their numbers after an overnight stay in air.
 B. Freezing bedding is even more effective than washing when it comes to killing dust mites, reducing 95.1 percent of their numbers after an overnight stay in a freezer.
Answer: B