Speaker A: I'm going to the park with some friends for a barbecue on Sunday. Would you like to join usSpeaker B: ______ A: Why not on Saturday You see, I have an important appointment on Sunday. B: Thanks, but unfortunately I have to take my sister to the airport on Sunday. C: That's a wonderful idea. Barbecue is one of my favorites. D: What preparation do you expect me to do for the barbecue