Mark knew that his best friend, Jane, using the company’s money for her mother’s medical bill. However, he did not want to tell anyone about this. If he told the truth, Jane would be fired and had no money to take care of her mother. In contrast, if he did nothing, he might be the accomplice if someone knew about Jane’s behavior. According to this, he decided to resign from the company because he could not find any better option. Which principle does Mark try to apply?