Context: Figure: Rainbow Reef.
Rainbow Reef is a tropical coral reef ecosystem near Fiji, a group of islands in the southern Pacific Ocean.
Which better describes the Rainbow Reef ecosystem?
A. It has bright sunlight. It also has shallow water.
B. It has water with not much salt. It also has only a few types of organisms.
Identify the correct option from the choices provided and respond with the letter of the correct option.

A