It is Either D or A most likely D
Not sure how it's an English question, but Batteries have three parts, an anode (-), a cathode (+), and the electrolyte. The cathode and anode (the positive and negative sides at either end of a traditional battery) are hooked up to an electrical circuit. The chemical reactions in the battery causes a build up of electrons at the anode.
Answer:
I would choose the be invisible lol it sounds realy cool
