Uses two Field-coil lengths
        
             
        
        
        
I would have to say A. All answer choices are hazardous risks
        
                    
             
        
        
        
You should first consult with past teachers of a similar subject to determine if they they think it's fitting and then to your counselor/ scheduling official. (Please be sure you have any prerequisites for the course, have summerwork/ projects to complete)