Passenger: What flights are there from London to Moscow for tomorrow Clerk: I’ll find out for you. Oh, BA Flight takes off from Heathrow and flies direct. Passenger: ______ Clerk: You’ll have to be at the West London Air Terminal by 8 : 00 at the latest.

A．Later colonists did not know how to thatch.
B．Thatching was considered dangerous.
C．Other roofing materials were available.
D．Thatching was unsuitable for the climate.