Explanation:

The Coral Triangle is a marine area located in the western Pacific Ocean. It includes the waters of Indonesia, Malaysia, the Philippines, Papua New Guinea, Timor Leste and Solomon Islands. 

• Named for its staggering number of corals (nearly 600 different species of reef-building corals alone), the region nurtures six of the world’s seven marine turtle species and more than 2000 species of reef fish. 
• The Coral Triangle also supports large populations of commercially important tuna, fueling a multi-billion dollar global tuna industry. 
• Over 120 million people live in the Coral Triangle and rely on its coral reefs for food, income and protection from storms.

Hence option 3rd is correct.