Answer:
ozone is dangerous at ground level.
Explanation:
Ozone is a very active gas. When it is lower down in the atmosphere, it is closer to living things and can harm them. It can damage the leaves of plants and effect how they use sunlight to provide food. In humans it can cause headaches, eye irritation, coughs and chest discomfort.
 
        
             
        
        
        
A. Practicing abstinence 
B. Hand washing
C. Using insecticide 
        
                    
             
        
        
        
Answer:
It has to be C
Explanation:
It's the most important answer, and you have to be told by a doctor/specialist that your diagnosed by  ancer.