Answer: Give short responses, as they are more effective.
i really wouldn't try to use any of these choices though. I would really like to get the audience's attention so I would answer there questions but I would also ask the audience what they think I should do to improve via presentation to the audience to peak their interest.
Explanation: None of these are really a good strategy for interacting with the audience in an effective way, but if this is the only thing provided for you, I would go for giving short responses.