Almost 3000 people died directly from the attacks (the official number, which includes the attackers) is 2996. 
However, the actual death toll connected to the attack indirectly is bigger and it's harder to asses, as it lead to the US military actions in the middle East, searching for Osama Bin laden.
        
             
        
        
        
People conform to peer pressure because as imperfect humans we don't always make the right decisions so people conform to peer pressure because they may feel left out or accused of not doing what others are doing. Impact? well peer pressure is common and devastating so its like a burned scar emotionally. Me? No due to my age I haven't been in that type of situation but soon I will and I hope I don't give in to pressure.
        
                    
             
        
        
        
Radio Waves transmit the least amount of energy.
        
             
        
        
        
The answer is B. because the peaces move making friction which results in the magnetic field.