**Sightseeing tripstwice dailyBuses – 9.00 a.m. & 2.00 p.m.Tickets only available fromtourist office**Câu hỏiWhat does this notice tell tourists? A. They cannot buy tickets on the bus. B. They must book both trips at 9.00 a.m. C. Each sightseeing trip lasts two hours. D. There is only one sightseeing trip each day.