This is late but for anyone else who needs it...It's D. Far left
 
        
             
        
        
        
3 of them left and i just need points lol sorrrry
        
             
        
        
        
Answer:
B - To increase the rate of the reaction 
Explanation:
Catalysts speed up the reaction without being reactants or products, so aren't used up in the reaction. 
 
        
             
        
        
        
The electric and magnetic fields are generated by moving electric charges, the electric and magnetic fields interact with each other, the electric and magnetic fields produce forces on electric charges, the electric charges move in space. 
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 I hope it'll help you....</h3>