Which of the Following Is Not Considered Ethically Questionable

Multiple Choice

Which of the following is not considered ethically questionable?

A) Exaggerating your opening offer.
B) Talking to superiors of your negotiating opponent to suggest things that would undermine their confidence in your opponent.
C) Promising that good things will happen to your opponent if he or she gives you what you want,even if you know that you can't or won't deliver these things.
D) Offering future concessions in return for immediate concessions.