Question

—The ice cream is really delicious. Can I have some more?

Answer 1

D

D　句意：“冰激凌确实很可口，我能再吃一些吗？”“请便。”be my guest“请便(用于礼貌地同意别人的请求)”，符合语境。behave yourself“检点，举止规矩有礼”；do it yourself“自己动手”。