Which Statement Regarding Florence Nightingale's Ideas About Ethics Is Correct

Which statement regarding Florence Nightingale's ideas about ethics is correct?

A) Nursing is a call to service, and the moral character of persons entering nursing is important.
B) Ethical principles are based on the values of the individual nurse.
C) Society will dictate the ethical principles to which nurses must adhere.
D) Ethics are very important in times of war, such as in the Crimean War, when she set up public health centers.