Answer:
B. the Great Barrier Reef
Step-by-step explanation:
The Australian Great Barrier Reef is a very large and diverse coral system with a high level of biodiversity. It is the largest coral reef on earth. A reef barrier is a long, narrow coral formation that extends parallel to the coastline of a territory, most of which is underwater. The Great Barrier Reef is located in the Coral Sea on the northeast coast of Australia. It is 2,000 kilometers long from north to south.