The answer is c because the subject is the topic of the story pretty much like if I where to write something about myself I would be the subject and let's say the theme is about bravery and I have to deal with that so yeah C
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.
3. Blanche doesn't want him to see her which putting the lantern on will dim the light