Answer: B) family, social, personal factors
Explanation: Although children and teenagers frequently experiment with drugs in a social context, some characteristics can make certain people more inclined to misuse drugs. Because her peers are using it, an adolescent may take a substance, but her usage may spiral out of control.
 
        
             
        
        
        
C..................................................................................................is your answer
        
                    
             
        
        
        
Answer:
The answer is 2:  A series of physical and psychological reactions that occur when you respond to a demanding or threatening situation.
Explanation:
Process of elimination:
1 - You can never completely eliminate stress
3 - Stress doesn't always manifest for a physical threat, it can form because you have a test next period or because you have an upcoming project,
4 - Stress is not always harmful, it also can come and go and you might even feel better afterwards, as in cases of physical stress.
 
        
                    
             
        
        
        
Red Blood Cells i believe are not part of the immune system. They carry oxygenated blood to the organs of the body