Which of the following does not necessarily describe ethics?
a. laws that all people must follow
b. guidelines for good behavior
c. unwritten and written rules that all scientists must follow while conducting research

Ethics is a part of philosophy, a set of moral principles and rules of behavior based on ideas about what is morally good and bad. From the given  options the following statements do not necessarily describe ethics:
a. Laws that all people must follow . - People do not have to follow the ethic rules. It is their free will.
c.Unwritten and written rules that all scientists must follow while conducting research. - Scientists can follow, but do not have to follow the ethic rules. They must follow other rules in order to have a correct research.