Which describes the requirements for making an electromagnet?



 
A.
A battery, a length of wire, and an iron nail must be connected in an open series circuit. In addition, the wire must be coiled around the body of the battery.


 
B.
A battery, a length of wire, and an iron nail must be connected in an open parallel circuit. In addition, the wire must be coiled around the body of the battery.


 
C.
A battery, a length of wire, and an iron nail must be connected in a closed series circuit. In addition, the wire must be coiled around the body of the nail.


 
D.
A battery, a length of wire, and an iron nail must be connected in a closed parallel circuit. In addition, the wire must be coiled around the body of the nail.