$19.$ A simple situation in which two parties come together and freely agree to an exchange is only prima facie ethically legitimate because O A$.$ it involves the consent of both parties involved and leaves no room for unethical acts. O B$.$ it rejects the assumption that individuals are capable of pursuing their own ends. O C$.$ certain conditions must be met before it can be concluded that autonomy has been respected and mutual benefit has been achieved. O D$.$ research studies prove that a simple exchange doesn't involve unethical situations.