Which act is associated with fatigue or boredom and may become addictive when others perform it?

• A. Yawning
• B. Laughing
• C. Sighing
• D. Chewing

Answer: (A)

Yawning is the behavior that fits fatigue or boredom, since people often yawn when they’re tired or not mentally engaged. An interesting part of yawning is that it tends to spread from person to person—seeing or hearing someone else yawn makes you more likely to yawn too. That social contagion can feel almost addictive in a group, because your own yawning mirrors others. Laughing, sighing, and chewing don’t have that same clear link: laughing usually signals humor, sighing expresses emotion like frustration or relief, and chewing isn’t specifically tied to fatigue or boredom or to contagion from others.