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

Choose the word or phrase among A, B, C or D that best fits the blank space in the following passage.
(1)......on the vast delta of the river mouths of Dong Nai, Sai Gon and Vam Co, Can Gio Mangrove Forest in Ho Chi Minh City is an ecosystem (2).......aquatic ecosystem and land ecosystem, freshwater ecosystem and marine ecosystem. (3).......150 flora species,744 fauna species, 130 species of birds and 130 species offish. In the core zone of Can Gio Mangrove Forest, Ho Chi Minh City invested to build Vam Sat Ecological Tourist Site with many tourist (4)....... such as: a crocodile farm, a hat lagoon, a bird yard. Tang Bong lower, a (5)...........garden and many games of fishing crocodile, sailing boats, rowing boats... Can Gio is the green (6)........ of Ho Chi Minh City and is assessed as the best restored, care and (7)......... place in Viet Nam and worldwide. This is also the ideal place for eco-tourism and (8)........... research. On 21 January 2000, UNESCO (9).............Can Gio (10)............... a world biosphere reserve.Question 1