Answer: a. an action is morally right just because it is required by an optimific social rule.
Step-by-step explanation:
Rule of consequentialism is of opinion that an act can be considered right based on its correlation with some special code rules and not based on how good the result of the consequence is.
For example it is a world wide moral standard that lying is not good, but the rule of consequentialism approves lying if it will save a life.