80 According to the passage, which of the following is true? (A)Hoi An has never been influenced by foreign cultures and has never traded with other countries. (B)Hoi An has become a UNESCO World Heritage site since the 16th century. (C)Tourists are attracted to Hoi An to admire its modern architecture and related arts. (D)The number of tourists to Hoi An has increased substantially after it was recognized as a World Heritage site.