综合语言运用与情景对话 — 英语选择题

Lingling 在机场为外宾指路时，外宾说："Excuse me, could you tell me the way to the toilet?" Lingling 应该怎样回答最礼貌得体？A. Go along this street and turn left at the second crossing. It's on your right. B. You can't find it. Go away! C. I don't know where is it. Ask others. D. Why do you want to go there?