It would be insulator because an insulator kills electricity, it can't travel through it.
The correct answer is D.
I hope that helped! c:
1 mole Fe produces 1 mole Cu
<span> molar mass of Fe is 55.8 g / mole
answer: </span><span>55.8g</span>
12% NaCl is the answer I came to... Have a GREAT day!!! :)