Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage

In the early morning of the first day, the guide will pick you up and transfer to Nam Cat Tien National Park, located on a low mountainous area of Dong Nai Province. Nam Cat Tien is an area which represents a special ecosystem of wet (1) ____ with biodiversity.

You will take a boat trip along the Dong Nai River to view the (2) ____ on the river banks. You can stop at the grassland area to search for peacocks, jungle fowl and birds that prefer a more open habitat. After that, you can continue to go to Kim Lan Village, once a French military camp and now the main village to the one ethnic (3) ____ of the park.

The song of birds will wake you up in the morning of the second day. You go hiking to the crocodile lake with plenty of (4) ____ to see many varieties of bird life and, if you are lucky, the chance of spotting larger mammals. The Siamese Crocodile is an endangered (5) ____ and this is one of the last remaining places in the world that you can still see them in the wild. In the evening, a walking tour along the track following the river through the botanical garden to Heaven Rapids, which provide you with good opportunities to see the birds and possibly the gibbon.

(1) _________

• A. 
  places
• B. 
  varieties
• C. 
  forests
• D. 
  area