【正确答案】 B

【答案解析】[听力原文]
   The 2019 China Beijing International Horticultural Exhibition will open on April 29, hosting more than 16 million people from 86 countries and 26 international organizations. Construction work on four main pavilions for the expo has been completed. The infrastructures have been put into operation in the park, said the deputy director of the 2019 expo coordination bureau.
新闻第一句提到，2019年中国北京国际园艺博览会将于4月29日开幕，届时将有来自86个国家和26个国际组织的1,600多万人参加。所以与会的共有86+26=112个国家和组强。故选B。