Fact 1: Competition may lead to aggressive behaviors or displays of aggression.

Fact 2: Aggression is the desire or intent to cause harm.

Given the two facts above, answer the question "What can cause harm?" with the following options: 
- Sulfur dioxide
 - burning coal
 - Medical treatment
 - treats
 - Good feelings
 - cigarettes
 - competition
 - emissions


 

       competition  