Which statements accurately describe Charles Darwin’s Subsidence Theory related to coral reef formation?

A) The theory suggests that coral reefs form around sinking volcanic islands.

B) According to Darwin, atolls are the final stage in a sequence of coral reef development.

C) When the land completely submerges it leaves only rings of coral surrounding a central lagoon known as Fringing Reefs

D) Darwin believed that the land or island where the reefs form gradually subsides, allowing the reefs to grow upward.