Context: Figure: Great Barrier Reef.
The Great Barrier Reef is a tropical coral reef ecosystem near the northeastern coast of Australia.
Which better describes the Great Barrier Reef ecosystem?
A. It has salty water. It also has many different types of organisms.
B. It has water with not much salt. It also has many different types of organisms.
Select the correct answer from the provided options and reply with the letter associated with it.

A