Objective: How can you find out what someone really wants for their gift?

Which of the following solutions is more sound in terms of naive physics reasoning?

Choose your answer from: (A). Tell them you already got their gift, then they'll try to guess, when they guess make note of what they say (You'll get great ideas).. (B). Tell them you won't get their gift, then they'll try to guess, when they guess make note of what they say (You'll get great ideas)..
(A).