单项选择题

Questions 14 to 17 are based on the following passage. At the end of the passage, you will be given 20 seconds to answer the questions.
Now listen to the passage.
The aim to create Everglades National Park was to ______.

A. protect the local ecosystem from damage
B. build the largest tropical wilderness
C. combine the nine parks that already existed
D. shelter migratory birds from North America