How Does the Text Define Ethics

How does the text define ethics?

A) a moral code adopted by each person--and the actions taken under that code--with respect to those it will affect
B) the quality of intention a person takes into each decision with respect to those whom the decision will affect
C) the actions a person takes to determine if they improve or lessen the quality of life for the community
D) the set of principles a person uses to determine whether an action is good or bad