They are called compound sentences.When 2 sentences are connected.
C is the correct answer.
Since commas connects 2 sentences.
Humans are naturally good. We just do bad stuff. Being evil is taught, not in nature. No person is born evil. They do evil stuff. Most evil things are done with bad intentions. But people can change. People can change from ‘evil’ to good.
I'm pretty sure it would be the setting because changing the story or main idea would change the story itself, rather than adapting it for your needs.