Which Statement About Hypothetical Imperatives Is True

Which statement about hypothetical imperatives is true?

A) Hypothetical imperatives command action that is necessary without any reference to intended purposes or consequences.
B) Hypothetical imperatives refer to the concept that some things just must be and don't require further justification.
C) Hypothetical imperatives refer to the imperative that you should do your duty and act the way you want everyone else to act.
D) Hypothetical imperatives are commands that designate certain actions to attain certain ends.