Which of the Following Statements Best Defines Ethics

Which of the following statements best defines ethics?

A) Ethics is a legal system for evaluating who profits in a business transaction.
B) Ethics is merely a different term for the laws and regulations created by a government.
C) Ethics is an irrational method used specifically in examining the morality of lives.
D) Ethics is a simplified term given to the momentary decisions one makes regarding which answer will lead to the most personally successful solution.
E) Ethics is a formal system for deciding what is right and wrong and for justifying moral decisions.