Answer:
D.
Explanation:
It would not be gain because it would say +6 instead of -2. Having a -2 charge means it wants to loose 2 electrons so it can form a full shell of 8 electrons. It wants to be inert (stable).
- Hope that helps! Please let me know if you need further explanation.
I believe it was John Newlands.
Hope that helped
I feel like it would be C, because headphones are connected to energy as well... I might be wrong