Alan and His Friends Are Being Asked to Register for a Stress

Alan and his friends are being asked to register for a stress management retreat. The leaders are a husband and wife, who are both young, attractive, and charming. The husband tells Alan that he has a doctorate and his wife has a masters' degree. Alan and his friends are then told that there are only ten more slots left; and if they all sign up now, they will get a discount. According to Cialdini, Alan and his friends should:

A) mentally separate the requesters from their offer.
B) ask themselves "how expert these people are" in stress management.
C) combat the scarcity pressures.
D) do all of the above.