I'm not the only one who's a student who's a student who's a student.
I think the answer is B because when he talks about the light dying from his eyes it refers to his death.
Think of it like this
Internal: A force inside yourself
External: A force outside of yourself
So if there an external force, it’s a force from outside so an example would be bullying. You wouldn’t want to go where you are being bullied so that would be an outside force affecting you.