Choose the best variant: A: What time does their plane arrive at London airport? B: Just __ . I"ll check on their website. Bbl6epuTe of MH OTBeT: a second a day an hour a week

The best variant is A: "What time does their plane arrive at London airport?" This question is clear and directly asks for the specific information needed. The other options (B, C, D) are not suitable as they do not provide a clear answer to the question.