challenge: Where is the Port of Huizhou located?
  
  A. Hong Kong, immediately west of Shenzhen and Huizhou
  B. Huizhou, Guangdong, People's Republic of China, immediately east of Shenzhen and Hong Kong
  C. Huizhou, Guangdong, People's Republic of China, west of Shenzhen and Hong Kong
  D. Shenzhen, Guangdong, People's Republic of China, east of Huizhou and Hong Kong
  Answer: 