Which of the sentences below best expresses the essential information in the highlighted sentence in the passage? Incorrect choices change the meaning in important ways or leave out essential information. A. Darwin claimed that, of the three types of coral reefs, only an atoll would be able to survive on a sinking platform. B. Darwin recognized that coral reefs achieved success by growing upward from a sinking land platform and becoming an atoll. C. Darwin argued that as a coral reef grew up from a sinking island, it would become a fringing reef, then a barrier reef, and finally, with the disappearance of the island, an atoll. D. Darwin's theory helped explain the disappearance of a number of islands by showing how coral reef growth caused them to sink below the ocean surface.