Consider the following statements about coral reefs and choose the correct option :
(A) Corals are skeletons of large marine animals.
(B) Coral reefs play an important role in protecting the coastline from erosion.
(C) When the living polyps die, their skeletons are left and collection of these skeletons form coral island.

Correct option is B

The correct option is (c) (B) and (C) are true.
Statement (A) is incorrect because corals are not skeletons of large marine animals. They are colonial animals made up of tiny polyps. Each polyp has a hard skeleton made of calcium carbonate.
Statement (B) is correct because coral reefs act as natural barriers that protect coastlines from erosion by absorbing the energy of waves.
Statement (C) is correct because when coral polyps die, their skeletons remain and form the foundation of the reef. Over time, these skeletons accumulate and can form coral islands.