单选题：根据以下材料回答第题：Passage FourNews has just been received of an air

根据以下材料回答第题： Passage Four News has just been received of an air crash in the north of England. The plane , which was on a charter flight from London to Carlisle, was carrying a party of businessmen on their way to a trade fair. It seems likely that the plane ran into a heavy fog as it was approaching Carlisle and was obliged to circle for some twenty minutes. Everything seemed to be going well. The pilot was in constant radio communication with Ground Control when the engines suddenly cut out and all contact was lost. The plane crashed on the site of the ancient Roman camp at Hadrian’s Hill , a place well known to archaeologists(考古学家)and tourists.
So far few details have been reported, but it is feared that at least twenty people lost their lives, among them the pilot, who was killed instantly, The local ambulances and firemen were on the scene within minutes of the crash , but additional help had to be rushed from other areas.
Mr. Lesilie Collins, one of the survivors, told our reporter, “We passengers noticed the engines were making a funny noise. Of course we couldn’t see anything because of the fog, but the pilot said there was nothing to worry about. The next thing we know, the engines went dead. There was a rushing noise-and after that I don’t remember any more.”
Mr. Collins is now in hospital, being treated minor injuries. We will be bringing you further news of crash as we receive it . In the meantime relatives are asked to ring 02-3457211 for information.The plane was_________. A．flying some businessmen to London
B．on a regular flighy to London
C．returning from a trade fair
D．bound for Carlisle