Answer:
d. Virtue and rules are complementary aspects of the same morality
Explanation:
William Frankena or William Klaas Frankena was moral philosopher in America. He was well known for his contribution in virtue ethics. In his life time, William Frankena was a member of the philosophy department in Michigan University for a period of 41 years.
William Frankena states that virtue and rules are the complementary aspects of same morality while supporting the use of virtue ethics.
Hence the correct option is (d).