Assertion (A) : The great Barrier Reef is one of the natural wonders of the world.
Reason (R) : The Great Barrier Reef is formed by the tiny coral polyps.
(a) Both A and R are individually true and R is the correct explanation of A
(b) Both A and R are individually true and R is not the correct explanation of A
(c) A is true but R is false
(d) R is true but A is false