Which of the Following Best Describes Immanuel Kant's Categorical Imperative

Which of the following best describes Immanuel Kant's categorical imperative?

A) If an action cannot be taken repeatedly,then it is not right to be taken at any time.
B) One should take the action that produces the least harm or incurs the least cost.
C) One can put values in rank order and understand the consequences of various courses of action.
D) If an action is not right for everyone to take,it is not right for anyone to take.
E) You should act towards others as you would like them to act towards you.