Question: To prevent headaches from eye strain.

  Options: 
 A. Use the 20-20 rule. Look at something 20 inches away for 20 seconds every 20 minutes. This is a method proven to stop eye strain and prevent headaches.
 B. Use the 20-20 rule. Look at something 20 feet away for 20 seconds every 20 minutes. This is a method proven to stop eye strain and prevent headaches.
Answer: B