Answer:the best activity Karen should do is weight training
Explanation:
 
        
             
        
        
        
The ansewer is d.  I don't really wanna explain it but I need more letters to post answer :)
        
             
        
        
        
B. Old Stone Age.........................
        
             
        
        
        
Answer:
B. drives
Explanation:
A student is trying to reach a goal, that goal is to get good grades. If I wanted to get a phone for working hard in school, it would then be an incentive.