Final answer:
Option D). The physician's actions described in the question exemplify the principle of Duty of Care, which involves providing reasonable care and protection to ensure the well-being of patients.
Step-by-step explanation:
The physician's actions as they are outlined in the question serve as an illustration of the duty of care concept. Healthcare workers have a moral and legal duty to take reasonable precautions to protect their patients and to look out for their best interests. This is known as the duty of care. By alerting the residents of the nursing home about the outbreak and taking precautions to keep them safe from the contagious illness, the doctor is carrying out their professional obligation in this instance.