
Passage: The results of a survey of businessmen's trust in 31 provinces, municipalities and autonomous regions in China showed that half of the locals believed that locals were trustworthy. For example, the reliability score scored by Beijingers for Beijingers is 57.9. The score for Tianjin people is 15, with one exception, that is, Hainan people themselves do not trust Hainan people.
Question: Which of the followings, if true, would provide a reasonable explanation for the above exception?
A. A.Hainan has a lot of liars, and they don't trust each other
B. B.The vast majority of those inspected in Hainan were left behind from other places to do business there.
C. C.Foreigners don't know much about Hainan businessmen and give them a very low trust score.
D. D.Most of the businessmen doing business in Hainan are not locals.
Answer: